Joseph B. Walther (born 1958) is the Mark and Susan Bertelsen Presidential Chair in Technology and Society and the Director of the Center for Information Technology & Society at the University of California, Santa Barbara. His research focuses on social and interpersonal dynamics of computer-mediated communication, in groups, personal relationships, organizational and educational settings. He is noted for creating social information processing theory in 1992 and the hyperpersonal model in 1996.