Jacob Moreno was a Romanian-American psychiatrist and the founder of psychodrama, a therapeutic approach that uses guided drama and role-playing to help individuals explore their emotions and relationships. Born in 1889, he developed innovative techniques to facilitate personal growth and healing through spontaneous and creative expression. Moreno also contributed to the field of sociometry, which studies social relationships and group dynamics. His work emphasized the importance of understanding interpersonal connections and how they influence individual behavior. Moreno's ideas have had a lasting impact on psychology, therapy, and group work, making him a significant figure in the field.