history of birth order theory

Alfred Adler, an Austrian psychiatrist, was the first to suggest birth order's effect on personalities in the 1920's.

Frank Sulloway elaborated on Adler's theory in1997.

Critics such as Fred Townsend and Toni Falbo argue against their theories in the early 2000's.

Alfred Adler, creator of Birth Order Theory

Toni Falbo, well known Birth Order Theory critic