He didn't have any contributions in psychology, but was in ophthalmologist, a medical degree in 1884, and one in philosophy.

Design of psychopharmaca

Jean Piaget's most notable contributions to psychology were in the field of development. He theorized that children go through stages of development.

Edward Titchener is known for introducing structuralism, a school of psychology that focused on analyzing the structures of consciousness through introspection. He also founded the first psychology laboratory in the United States and made significant contributions to the development of experimental psychology. Titchener's work laid the foundation for the study of mental processes in psychology.

Warren Steinberg has written:

'Masculinity' -- subject(s): Contributions in psychology of masculinity, Masculinity (Psychology), Men, Sex role, Psychology