Alfred Adler (/ˈædlər/; German: [ˈaːdlɐ]; 7 February 1870 – 28 May 1937) was an Austrian medical doctor, psychotherapist, and founder of the school of individual psychology. His emphasis on the importance of feelings of inferiority, the inferiority complex, is recognized as an isolating element which plays a key role in personality development. Alfred Adler considered a human being as an individual whole, therefore he called his psychology “Individual Psychology” (Orgler 1976).
Adler was the first to emphasize the importance of the social element in the re-adjustment process of the individual and who carried psychiatry into the community. A Review of General Psychology survey, published in 2002, ranked Adler as the 67th most eminent psychologist of the 20th century. (Source)