[2] At Yale, he teaches in Jurisprudence, Constitutional Law, Cyberlaw, and Cybersecurity.

He has been cited for his work on the planning theory of law and for pioneering experimental jurisprudence.

[4] He serves as an editor of Legal Theory and the Stanford Encyclopedia of Philosophy.

With Oona A. Hathaway, he developed the concept of "outcasting" in international law and has been critical of humanitarian intervention without authorization from the UN Security Council.

[5] His book with Hathaway, The Internationalists: How a Radical Plan to Outlaw War Remade the World, was published by Simon & Schuster in September 2017, and received wide acclaim by The New Yorker, The Financial Times, and The Economist, among others.