Sigmund Freud was an Austrian neurologist and the founder of psychoanalysis.
Erich Fromm was a German-American social psychologist and philosopher who significantly impacted the fields of humanistic psychology and psychoanalysis, advocating for individual freedom and societal change.
Ibn Sina, also known as Avicenna, was a Persian polymath, philosopher, and physician whose extensive works laid foundations in various fields, including medicine, philosophy, and logic.
B.F. Skinner was an American psychologist and leading proponent of behaviorism, whose groundbreaking work in operant conditioning revolutionized the field of psychology.
Albert Ellis was an American psychologist and creator of Rational Emotive Behavior Therapy, a precursor to Cognitive Behavioral Therapy.