Elliott Jaques was a Canadian psychoanalyst and organizational psychologist, best known for his work on organizational theory and management. He introduced the concept of time span of discretion, which refers to the length of time an individual can plan and execute tasks. This idea has influenced how organizations structure roles and responsibilities. Jaques also developed the Stratified Systems Theory, which categorizes organizational levels based on complexity and decision-making. His research emphasized the importance of aligning individual capabilities with organizational needs, contributing to better management practices and workplace efficiency.