Tim Wilkinson was born in Liverpool in 1951 and was educated at Merchant Taylorsa School, Crosby, then at Robert Gordona s College in Aberdeen. After graduating with an M.A. (Hons) in English at Aberdeen University, he then spent his entire career teaching English at Cults Academy. He has now retired to rural Aberdeenshire. He has written two histories of his local cricket club, Banchory C.C., for whom he has played for over 50 years. Tim suffers from the incurable disease of book collecting and has amassed a collection of over 3,000 first editions. Make that 3,001.

"Totally riveting. I couldn't put it down" VICTORIA HISLOP "Masterful, original and painfully gripping" PHILIPPE SANDS "A heart-piercingly brilliant book about a woman whose personal life put her in the cross-hairs of history" HADLEY FREEMAN "I don't think I've ever read a book that has moved me more" ANTHONY HOROWITZ "A brilliant and fresh take on a famous case" SIMON SEBAG MONTEFIORE Ethel Rosenberg's story has been called America's Dreyfus Affair: a catastrophic failure of humanity and justice that continues to haunt the national conscience, and is still being played out with different actors in the lead roles today. On 19th June 1953 Ethel Rosenberg became the first woman in the US to be executed for a crime other than murder. She was thirty-seven years old and the mother of two small children. Yet even today, at a time when the Cold War seems all too resonant, Ethel's conviction for conspiracy to commit espionage on behalf of the Soviet Union makes her story still controversial. This is an important moment to recount not simply what FBI Director J. Edgar Hoover called the 'trial of the century', but also a timeless human story of a supportive wife, loving mother and courageous idealist who grew up during the Depression with aspirations to become an opera singer. Instead, she found herself battling the social mores of the 1950s and had her life barbarically cut short on the basis of tainted evidence for a crime she almost certainly did not commit. Anne Sebba's masterly biography makes full use of the dramatic prison letters Ethel exchanged with her husband, lawyer and psychotherapist over a three-year period. Sebba has also interviewed Ethel's two sons and others who knew her, including a fellow prisoner. Ethel's tragic story lays bare a nation deeply divided and reveals what happens when a government motivated by fear tramples on the rights of its citizens.

While African National Congress narratives dominate much of the scholarship on South Africa’s freedom struggle, Josie Mpama/Palmer’s political life offers a different perspective. Highly critical of the patriarchal attitudes that hindered black women from actively participating in politics, Mpama/Palmer was an outspoken advocate for women’s social equality and encouraged black women to become more involved in national conversations.

The first black woman to join the Communist Party of South Africa and an antiapartheid activist, Josie Mpama/Palmer remained involved in critical issues all her life, especially protests against Bantu Education and other forms of racial and sexist discrimination. She was an integral figure in establishing the Federation of South African Women, an organization open to women of all races.

Mpama/Palmer’s activism and political legacy would become an inspiring example for women in South Africa and around the world to get up and get moving.

The Inevitability of Tragedy is a fascinating intellectual biography that examines Henry Kissinger's role in American government through his ideas. It analyses the continuing controversies surrounding Kissinger's policies in such places as Vietnam and Chile by offering an understanding of his definition of realism; his belief that foreign affairs must be conducted through a balance of power; and his view that promoting democracy is likely to result in defeats for the United States. Barry Gewen places Kissinger's ideas in a European context by tracing them through his experience as a refugee from Nazi Germany and exploring the links between his notions of power and those of his mentor, Hans Morgenthau, as well as those of two other German-Jewish emigres-Leo Strauss and Hannah Arendt-who shared his concerns about the weaknesses of democracy.

Drawing on Nelson Mandela's own unfinished memoir, Dare Not Linger is the remarkable story of his presidency told in his own words and those of distinguished South African writer Mandla Langa 'I have discovered the secret that after climbing a great hill, one only finds that there are many more hills to climb. I have taken a moment here to rest, to steal a view of the glorious vista that surrounds me, to look back on the distance I have come. But I can only rest for a moment, for with freedom comes responsibilities, and I dare not linger, for my long walk is not ended.' Long Walk to Freedom.

In 1994, Nelson Mandela became the first president of democratic South Africa. Five years later, he stood down. In that time, he and his government wrought the most extraordinary transformation, turning a nation riven by centuries of colonialism and apartheid into a fully functioning democracy in which all South Africa's citizens, black and white, were equal before the law.

Dare Not Linger is the story of Mandela's presidential years, drawing heavily on the memoir he began to write as he prepared to finish his term of office, but was unable to finish. Now, the acclaimed South African writer, Mandla Langa, has completed the task using Mandela's unfinished draft, detailed notes that Mandela made as events were unfolding and a wealth of previously unseen archival material. With a prologue by Mandela's widow, Graça Machel, the result is a vivid and inspirational account of Mandela's presidency, a country in flux and the creation of a new democracy. It tells the extraordinary story of the transition from decades of apartheid rule and the challenges Mandela overcome to make a reality of his cherished vision for a liberated South Africa.

Written with Matt Eversmann, the decorated war hero immortalised in the film Black Hawk Down, James Patterson brings us firsthand wartime experiences of life on the battlefront

Soldiers, sailors, airmen, and Marines speak in their own words about real life in today's armed forces. These are the brutally honest stories usually only shared amongst comrades in arms. Here, in the voices of the men and women who've fought overseas from Vietnam to Iraq and Afghanistan, is a rare eye-opening look into what wearing the uniform, fighting in combat, losing friends and coming home is really like.Walk in my Combat Boots is a powerful collection of never-before-told war stories crafted from hundreds of original interviews by James Patterson, the world's most trusted storyteller, and First Sergeant US Army (Ret.) Matt Eversmann, part of the Ranger unit involved in the infamous Battle of Mogadishu portrayed in the movie Black Hawk Down.

'A completely extraordinary autobiography. One that reads like the most outlandish, beguiling fiction but that is - amazingly - all true' - William Boyd, Sunday Times bestselling author 'Outrageous fun...my goodness there are knee-tremblers galore in this racy memoir' - The Times 'A wonderful journey through 20th Century history. I thoroughly enjoyed it' - Lady Anne Glenconner, author of Lady in Waiting --- For fear of growing up like his stiff-upper-lipped Uncle Dick, Roderic Fenwick Owen (1921-2011) survived Eton, Oxford and the Second World War to become a travel writer, experiencing the varied wonders of the 20th century's people and places in that guise. Frequently finding himself party to crucial historical events (including experiencing Nazi Germany in 1939 and the Pentagon during the Cold War Years), his life featured a stellar cast of characters from Eisenhower and Jackson Pollock to Christopher Lee and Sean Connery. At the heart of Roddy's writing adventures lay his search for love, even if just for the night. He fell head over heels for, and married a Polynesian princess while beachcombing in Tahiti, but when a dazzling trip to 1950s New York opened his eyes to the fact he was more attracted to men than women, he was forced to continue his quest for his soulmate under threat of danger. This was at a time when the police were prosecuting and imprisoning more gay men than ever before, including some of his friends. Lyrical, witty and at times jaw-droppingly unbelievable, Oh, What A Lovely Century is both a highly personal memoir and a marvellous obituary of an ever-changing and now lost world - that was frequently the best of times, and sometimes the worst. --- 'If you have a penchant for posh goss, don't miss this riotous memoir' - Evening Standard '[Fenwick Owen] brushed the skirts of history ... a joy' - The Telegraph 'Stuffed to the gills with raucous anecdotes and mesmerising detail ... Fenwick Owen's memoirs are witty and touching but also an important record of how society has changed' - Jessica Fellowes, author of The Mitford Murders

Ray Hartley reveals how Cyril Ramaphosa pulled off one of the greatest political comebacks of modern times, and what lies in store for the new president as he embarks on a hefty clean-up operation of a country in shambles.

Ray Hartley’s bestselling 2017 biography, Ramaphosa: The Man Who Would Be King, offered a cogent analysis of how the former nearly-man of South African politics handled the key challenges he faced in the unions, in business and in politics. In this updated edition, Hartley questions whether the former‘man in the middle’ can lead from the front, now that he has publicly denounced the besmirched Zuma and his corrupted ANC and established himself as a worthy recipient of the country’s top job.

So begins a new era in South African politics.

Gedurende die Grensoorlog het die Spesiale Magte se 4 Verkenningsregiment tientalle klandestiene seewaartse operasies saam met die SA Vloot uitgevoer. Van Cabinda in Angola tot Dar es Salaam in Tanzanië het hulle strategiese teikens soos oliedepots, vervoerinfrastruktuur en selfs Russiese skepe aangeval. Die bestaan van 4 Recce is grootliks geheim gehou, ook in die SAW.

Ystervuis uit die see beskryf 50 operasies deur 4 Recce, ander Spesmagte-eenhede en die SA Vloot. Daaronder tel Operasie Kerslig (1981), waartydens ’n operateur dood en ander beseer is in ’n aanval op ’n olieraffinadery in Luanda, en Operasie Argon (1985) toe kaptein Wynand du Toit in Angola gevange geneem is.

Die skrywers, wat self aan etlike van die operasies deelgeneem het, het ook toegang gekry tot uiters geheime dokumente wat intussen gedeklassifiseer is. Hul dramatiese vertellings wys hoe veelsydig en doeltreffend hierdie elite-eenheid was.

Die omvattende boek is ’n moet vir enigeen met ’n belangstelling in die Spesmagte. Dit neem jou na die hart van die aksie, die adrenalien en vrees van seewaartse operasies.

A Financial Times Book Best Book of the Year 2020 A Foreign Affairs Best Book of the Year 2020 The gripping, untold story of how Saudi Arabia's secretive and mercurial new ruler rose to power. Even in his youth as a prince among thousands of princes, Mohammed bin Salman nurtured sweeping ambitions. He wanted power - enough of it to reshape his hyper-conservative, insular Islamic kingdom. When his elderly father took the throne in 2015, MBS got his chance. As the hands-on-ruler, he made seismic changes, working doggedly to overhaul the kingdom's economy, loosen its strict Islamic social codes and confront nearby enemies, especially Iran. His vision initially won fans at home and abroad as he convinced other nations that the moment had come to bet big on Saudi Arabia. Over time, however, the sheen of the visionary young reformer has tarnished, leaving many wondering whether MBS is actually an aspiring dictator whose lack of experience and rash decisions are destabilizing the world's most volatile region. Based on years of reporting and hundreds of covert interviews, MBS provides new insights into Saudi Arabia's catastrophic military intervention in Yemen, the bizarre detention of the Lebanese prime minister, the surprise arrest of hundreds of princes and businessmen, and the greatest scandal of the young prince's rise: the brutal murder of Saudi journalist Jamal Khashoggi by Saudi state officials with links to MBS - a crime that shocked the world. A riveting portrait of a determined autocrat on the rise, MBS asks how one man's actions and obsessions are shaking the Middle East.

The New York Times bestselling book from Supreme Court Justice Ruth Bader Ginsburg-"a comprehensive look inside her brilliantly analytical, entertainingly wry mind, revealing the fascinating life of one of our generation's most influential voices in both law and public opinion" (Harper's Bazaar). My Own Words "showcases Ruth Ginsburg's astonishing intellectual range" (The New Republic). In this collection Justice Ginsburg discusses gender equality, the workings of the Supreme Court, being Jewish, law and lawyers in opera, and the value of looking beyond US shores when interpreting the US Constitution. Throughout her life Justice Ginsburg has been (and continues to be) a prolific writer and public speaker. This book's sampling is selected by Justice Ginsburg and her authorized biographers Mary Hartnett and Wendy W. Williams, who introduce each chapter and provide biographical context and quotes gleaned from hundreds of interviews they have conducted. Witty, engaging, serious, and playful, My Own Words is a fascinating glimpse into the life of one of America's most influential women and "a tonic to the current national discourse" (The Washington Post).

'This book will take your breath away, break your heart, and leave you in awe' President Bill Clinton _______ Soldiers, sailors, airmen and Marines speak in their own words about real life in today's armed forces. These are the brutally honest stories usually only shared amongst comrades in arms; stories of life-and-death decisions, and learning how to live with the effects of horrific injuries, both physical and mental. In the voices of the men and women who've fought overseas, from Vietnam to Iraq and Afghanistan, this is a rare eye-opening look into what it's really like to wear the uniform, fight in combat, lose friends and come home. Walk in my Combat Boots is a powerful collection of never-before-told war stories crafted from hundreds of original interviews by James Patterson, the world's most trusted storyteller, and First Sergeant US Army (Ret.) Matt Eversmann, part of the Ranger unit involved in the infamous Battle of Mogadishu portrayed in the movie Black Hawk Down. _______ 'Raw, authentic, and above all, inspiring' Admiral William H. McRaven, US Navy (Ret.) 'Each of these stories of the personal experience of combat is unique, homespun, and honest' Brigadier General Peter Dawkins, US Army (Ret.) 'Painfully raw, improbably funny, and completely human' Stanley A. McChrystal, General, US Army (Ret.) 'A vivid and authentic portrait of life in the modern military . . . Powerful. This edifying collection captures the highs and lows of the military experience' Publishers Weekly 'Urgent and full of suspense . . . In this wide-ranging, consistently absorbing collection, the authors cover the entire spectrum of American military action during the last 50 years' Kirkus 'Extraordinary . . . a deeply intimate insider's look' Richard Engel, NBC News Chief foreign correspondent

Few figures hold as mythic a place in America's historical consciousness as John Brown. A fervent abolitionist, his New England reserve tempered by a childhood on the Ohio frontier, Brown advocated arming fugitive slaves to fight for their freedom, an idea that impressed Frederick Douglass, Ralph Waldo Emerson, and Henry David Thoreau. In 1855, answering the call of his five sons to join them in the desperate struggle for freedom in the new territories, John Brown became a hero of "Bleeding Kansas." When he returned east, the fiery leader launched his ambitious campaign to rouse the slaves to freedom with a raid on the federal arsenal at Harpers Ferry in 1859.

Labeled a madman for his failed military adventure, and repudiated even by prominent antislavery leaders, Brown was tried in a Virginia court and sentenced to hang for treason and sundry other crimes. In John Brown: Legend Revisited, the eminent historian Merrill D. Peterson brings the same blend of sharp-eyed analysis and narrative elegance to bear on Brown's legacy that he has used to unravel the images of Thomas Jefferson and Abraham Lincoln.

Brown's reputation has undergone a series of tectonic shifts since he met his death on the gallows just before the Civil War. Southerners viewed his exploits with apprehension, seeing Harpers Ferry as a harbinger of servile insurrection, while Brown's eloquence before the court won him sympathy in the North and confirmed his place there as a hero and martyr. Thoreau, the author of passive resistance, wrote of Brown as a man of conscience. Perhaps most important historically, Brown's exploits convinced Southerners that Lincoln's election meant secession and a call to arms.

Peterson gives us Brown in his own day, but he also shows how the flaming abolitionist warrior's image, celebrated in art, literature, and journalism, has shed some of the infamy conferred by "Bleeding Kansas" to become a symbol of American idealism and fervor to activists along the political spectrum. And so in the civil rights battles of the twentieth century, Brown became a hero to African Americans.

Learn how to manage stress, harness fear, and develop the mindset required to thrive under pressure in the powerful and inspiring new book from Jason Fox. We all face conflict in our daily lives. Some encounters threaten to crush us mentally, others cause anxiety and self-doubt, or damage our confidence. Whether serving in the Special Forces, rowing oceans or investigating some of the world's most notorious drug cartels, Jason Fox has experienced more than his fair share of these emotional and psychological battles. Drawing on the practices of the British military and the techniques he has developed during his career, Jason Fox shows how anyone can build the strength of mind and the resilience of an elite soldier. In Life Under Fire, Fox shares the tools he has used to overcome the extreme and hostile environments that have tested his resolve, and shows how you, too, can employ them to build the grit and inner strength needed to conquer whatever challenges life puts in front of you.

In 1965 the German journalist Horst Kruger attended the Auschwitz trial in Frankfurt, where 22 former camp guards were put on trial for the systematic murder of over 1 million men, women and children. Twenty years after the end of the war, this was the first time that the German people were confronted with the horrific details of the Holocaust executed by 'ordinary men' still living in their midst. The trial sent Kruger back to his childhood in the 1930s, in an attempt to understand 'how it really was, that incomprehensible time'. He had grown up in a Berlin suburb, among a community of decent, lower-middle-class homeowners. This was not the world of torch-lit processions and endless ranks of marching SA men. Here, people lived ordinary, non-political lives, believed in God and obeyed the law, but were gradually seduced and intoxicated by the promises of Nazism. He had been, Kruger realised, 'the typical child of innocuous Germans who were never Nazis, and without whom the Nazis would never have been able to do their work'. This world of respectability, order and duty began to crumble when tragedy struck. Kruger's older sister decided to take her own life, leaving the parents struggling to come to terms with the inexplicable. The author's teenage rebellion, his desire to escape the stifling conformity of family life, made him join an anti-Nazi resistance group. He narrowly escaped imprisonment only to be sent to war as Hitler embarked on the conquest of Europe. Step by step, a family that had fallen under the spell of Nazism was being destroyed by it. Written in accomplished prose of lingering beauty, The Broken House is a moving coming-of-age story that provides an unforgettable portrait of life under the Nazis. Yet the book's themes also chime with our own times - how the promise of an 'era of greatness' by a populist leader intoxicates an entire nation, how thin is the veneer of civilisation, and what makes one person a collaborator and another a resister.

'Beautifully told' John le Carre 'More than just history' Michael Palin 'Truly exceptional' Jon Snow 'Absolutely remarkable' Edmund de Waal In this remarkably moving memoir, Ariana Neumann dives into the secrets of her father's past: years spent hiding in plain sight in wartorn Berlin, the annihilation of dozens of family members in the Holocaust, and the courageous choice to build anew. 'The darkest shadow is beneath the candle.' As a child in Venezuela, Ariana Neumann is fascinated by the enigma of her father, who appears to be the epitome of success and strength, but who wakes at night screaming in a language she doesn't recognise. Then, one day, she finds an old identity document bearing his picture - but someone else's name. From a box of papers her father leaves for her when he dies, Ariana meticulously uncovers the extraordinary truth of his escape from Nazi-occupied Prague. She follows him across Europe and reveals his astonishing choice to assume a fake identity and live out the war undercover, spying for the Allies in Berlin - deep in the 'darkest shadow'. Having known nothing of her father's past, not even that he was Jewish, Ariana's detective work also leads to the shocking discovery that a total of twenty-five members of the Neumann family were murdered by the Nazis. Spanning nearly ninety years and crossing oceans, When Time Stopped is a powerful and beautifully wrought memoir in which Ariana comes to know the family that has been lost - and, ultimately, her own beloved father.

Read the fascinating story of one of the greatest unsung figures of the nature conservation movement, founder of the RSPB and icon of early animal rights activism, Etta Lemon. A heroine for our times, Etta Lemon campaigned for fifty years against the worldwide slaughter of birds for extravagantly feathered hats. Her legacy is the RSPB, grown from an all-female pressure group of 1889 with the splendidly simple pledge: Wear No Feathers. Etta's long battle against 'murderous millinery' triumphed with the Plumage Act of 1921 - but her legacy has been eclipsed by the more glamorous campaign for the vote, led by the elegantly plumed Emmeline Pankhurst. This gripping narrative explores two formidable heroines and their rival, overlapping campaigns. Moving from the feather workers' slums to high society, from the first female political rally to the rise of the eco-feminist, it restores Etta Lemon to her rightful place in history - the extraordinary woman who saved the birds. ETTA LEMON was originally published in hardback in 2018 under the title of MRS PANKHURST'S PURPLE FEATHER. 'A great story of pioneering conservation.' KATE HUMBLE 'Quite brilliant. Meticulous and perceptive. A triumph of a book.' CHARLIE ELDER 'Shocking and entertaining. The surprising story of the campaigning women who changed Britain." VIRGINIA NICHOLSON 'A fascinating and moving story, vividly told.' JOHN CAREY 'A fascinating clash of two causes: rights for women and rights for birds to fly free not adorn suffragettes' hats. An illuminating story, provocative, well-researched and brilliantly told.' DIANA SOUHAMI

Katharine Campbell's father Sholto Douglas was the hero of her childhood, an unconventional senior commander in the Royal Air Force, described as 'a gloriously contentious character'. Following childhood abandonment and poverty, Sholto rose through the ranks of the fledgling RAF in the First World War before taking on a crucial role in the Second as head of Fighter Command and going on to serve as military governor in Germany in the war's devastating aftermath. But when Katharine was five years old, he began to be stolen away by strange night-time wanderings and daytime distress - including vivid flashbacks to his time signing death warrants in post-war Germany. The doctors called it dementia, but decades later, Katharine started researching her father's story and realised that she had observed the undiagnosed consequences of post-traumatic stress disorder. PTSD is a hot topic today. We're aware of the front-line soldier suffering from 'shell-shock' - but what about the senior officer giving the orders, who may be carrying hidden wounds accumulated over many years? We don't expect our military leaders to have PTSD, nor is it something they often recognise or acknowledge in themselves, yet this secret burden likely affects a surprising number of those making important tactical decisions. A thought-provoking insight into the damage done by military conflict, Behold the Dark Gray Man is the story of a daughter's search to understand the impact of war upon one of its most charismatic senior commanders.

'Before biography was fashionable, Antonia Fraser made the past popular' Guardian 'As a pure storyteller, Antonia Fraser has few equals' Sunday Times CAROLINE NORTON, a nineteenth-century heroine who wanted justice for women. Poet, pamphleteer and artist's muse, Caroline Norton dazzled nineteenth-century society with her vivacity and intelligence. After her marriage in 1828 to the MP George Norton, she continued to attract friends and admirers to her salon in Westminster, which included the young Disraeli. Most prominent among her admirers was the widowed Prime Minister, Lord Melbourne. Racked with jealousy, George Norton took the Prime Minister to court, suing him for damages on account of his 'Criminal Conversation' (adultery) with Caroline. A dramatic trial followed. Despite the unexpected and sensational result - acquittal - Norton legally denied Caroline access to her three children under seven. He also claimed her income as an author for himself, since the copyrights of a married woman belonged to her husband. Yet Caroline refused to despair. Beset by the personal cruelties perpetrated by her husband and a society whose rules were set against her, she chose to fight, not surrender. She channelled her energies in an area of much-needed reform: the rights of a married woman and specifically those of a mother. Over the next few years she campaigned tirelessly, achieving her first landmark victory with the Infant Custody Act of 1839. Provisions which are now taken for granted, such as the right of a mother to have access to her own children, owe much to Caroline, who was determined to secure justice for women at all levels of society from the privileged to the dispossessed. Award-winning historian Antonia Fraser brilliantly portrays a woman, at once courageous and compassionate, who refused to be curbed by the personal and political constraints of her time.

The world's leading expert on Osama bin Laden delivers for the first time the definitive biography of a man who set the course of American foreign policy for the 21st century, and whose ideological heirs we continue to battle today. In The Rise and Fall of Osama bin Laden, Peter Bergen provides the first reevaluation of the man responsible for precipitating America's long wars with al-Qaeda and its descendants, capturing bin Laden in all the dimensions of his life: as a family man, as a zealot, as a battlefield commander, as a terrorist leader, and as a fugitive. The book sheds light on his many contradictions: he was the son of a billionaire, yet insisted his family live like paupers. He adored his wives and children, depending on two of his wives, both of whom had PhDs, to make important strategic decisions. Yet he also brought ruin to his family. He was fanatically religious, yet willing to kill thousands of civilians in the name of Islam. He inspired deep loyalty yet, in the end, his bodyguards turned against him. And while he inflicted the most lethal act of mass murder in United States history, he failed to achieve any of his strategic goals. The lasting image we have of bin Laden in his final years is of an aging man with a graying beard watching old footage of himself, just another dad flipping through the channels with his remote. In the end, bin Laden died in a squalid suburban compound, far from the front lines of his holy war. And yet despite that unheroic denouement, his ideology lives on. Thanks to exclusive interviews with family members and associates, and documents unearthed only recently, Bergen's portrait of Osama will reveal for the first time who he really was and why he continues to inspire a new generation of jihadists.

Elizabeth Thorpe, codenamed Cynthia, was a glamorous American socialite recruited by MI6 to obtain intelligence from the Polish Foreign Ministry and from the Italian and Vichy French embassies in Washington. Her method was to seduce whatever targets could provide her with vital intelligence, a practice in which she hardly ever failed, enabling her to secure first the French and then the Italian naval codes. In the landings in North Africa, she was credited with having saved the lives of hundreds of Allied soldiers. This unique account by a British spymaster of his relationship with Cynthia, detailing his subsequent involvement with Kim Philby and the Cambridge spies and his dealings with his counterparts in the CIA and French intelligence, was entrusted by him to a junior colleague on the basis that it was not to be published until everyone in it was dead. Necessarily anonymous and impossible to fully verify, though most of it undoubtedly did happen and is part of the historical record, A Spy Called Cynthia provides a special insight into the world of intelligence and one of its most effective practitioners.