This thesis examines the impact that the dominant personalities of General Douglas MacArthur and Admiral Ernest King had in shaping Allied strategy in the Pacific during the Second World War. The concept of dominant personality is defined as containing three essential elements: arrogance, tenacity, and supreme competence. The lives of MacArthur and King are examined, demonstrating that the actions of each consistently reflected these characteristics, allowing them to dominate those around them. Three key decisions from the Pacific war are scrutinized for the impact of one or both of these dominant personalities. King and MacArthur affected these decisions in different ways. In the first, the decision to initiate carrier raids against Japan in early 1942, King acted unopposed in pushing his audacious plans through. The second decision was to invade Guadalcanal (Operation Watchtower) in August 1942. King and MacArthur drove this decision in parallel competition, each striving to begin offensive operations and each desiring to be in control. Finally, the long competition between the Central and Southwestern Pacific drives for primacy, culminating with the debate over invading Luzon or Formosa, is examined. In this case, MacArthur and King pursued mutually exclusive courses and stalemate nearly resulted.