His research interests are in Artificial Intelligence, Machine Learning, and applications to Crowdsourcing. Together with Tammy Waterhouse and Praveen Paritosh, he founded and manages the Human Computation intergroup at Google. Before transferring to Research, he helped launched a large-scale crowdsourcing system widely used by Googlers. He received his PhD from the University of Washington in 2011, supervised by Daniel S. Weld and Mausam.