Judith Donath
Associate Professor of Media Arts & Sciences at the MIT Media Lab; head of the Sociable Media Group. Ph.D. and Masters (M.A.?) in Media Arts and Science from MIT. Possibly the advisor of Fernanda Viegas; has co-authored several papers with her.
"Her work focuses on the social side of computing, synthesizing knowledge from fields such as graphic design, urban studies and cognitive science to build innovative interfaces for online communities and virtual identities. She is known internationally for pioneering research in social visualization, interface design, and computer mediated interaction." (from her homepage)
Impact
impact on the field; include what field(s)

