Cass is the Robert Walmsley University Professor at Harvard University, where he is on the law school faculty and an affiliate in the department of economics. He is also currently serving in the Biden Administration as senior counselor at the Department of Homeland Security. Cass was recently appointed as Distinguished Academic Visitor at Cambridge University, and he is serving as well on the Technical Advisory Group on Behavioral Insights and Public Health at the World Health Organization. From 2009 to 2012, he was administrator of the White House Office of Information and Regulatory Affairs. Cass has testified before congressional committees on many subjects, and he has been involved in constitution-making and law reform activities in a number of nations. In 2018, he was awarded Norway’s Holberg Prize, which is often described as the Nobel Prize for the humanities, law, and philosophy.  His many books include Nudge (with Richard H. Thaler) and The World According to Star Wars.