Jeffrey Heer is an assistant professor of computer science at Stanford University, where he works on human-computer interaction, visualization, and social computing. His research investigates the perceptual, cognitive and social factors involved in making sense of large data collections, resulting in new interactive systems for visual analysis and communication. The visualization tools developed by his lab (D3, Protovis, Flare, Prefuse) are used by researchers, companies, and thousands of data enthusiasts around the world. His group has received best paper and honorable mention awards at the premier venues in human-computer interaction and information visualization (ACM CHI, ACM UIST, IEEE InfoVis, IEEE VAST). In 2009 Jeff was named to MIT Technology Review's TR35; in 2012 he was named a Sloan Foundation Research Fellow. He holds B.S., M.S. and Ph.D. degrees in computer science from the University of California, Berkeley.