Donald E. Super was a prominent psychologist and career development theorist. He was born in 1910 in Hawaii and received his doctorate from Oxford University. Super published his first book on vocational guidance in 1942 and went on to found career guidance services. He developed one of the most influential career development theories, which proposes that careers progress through five life stages defined by age and roles. The theory emphasizes that self-concept and balancing internal/external factors shape career choices over a person's life span and across multiple life roles. Super's work had a significant impact on the field of career counseling and remains influential today.