Clifford Nass, American author and academic (b. 1958)
Clifford Ivar Nass (April 3, 1958 – November 2, 2013) was a professor of communication at Stanford University, co-creator of The Media Equation theory, and a renowned authority on human-computer interaction (HCI). He was also known for his work on individual differences associated with media multitasking. Nass was the Thomas M. Storke Professor at Stanford and held courtesy appointments in Computer Science, Education, Law, and Sociology. He was also affiliated with the programs in Symbolic Systems and Science, Technology, and Society.

Nass was the director of the Communication between Humans and Interactive Media (CHIMe) Lab, co-director of Kozmetsky Global Collaboratory (KGC) and its Real-time Venture Design Laboratory (ReVeL), and a co-founder of TeachAids.