Hari Sundaram is an Associate Professor in the Computer Science and in the Advertising Departments at the University of Illinois at Urbana-Champaign. His research, motivated by the challenge of "persuading millions of people to adopt behaviors (e.g. adopt healthy lifestyles) that would be beneficial to them,'' lies at the intersection of social network analysis and computational advertising. Analyzing the question of behavioral change at massive scale, requires us to develop new theoretical frameworks, design algorithms, build scalable systems and perform field experiments. His research has won awards from the ACM and IEEE societies.