Jeffrey has been a Non-Executive Director of Nuix since 2017 and was appointed as Deputy Chairman in February 2023, after stepping down from the role of Chairman. He served as US Ambassador to Australia (2009-2013) and as special counsel to President Obama in 2009. Jeffrey lives in Piedmont, California, USA.

Currently, Jeffrey is the General Counsel of Anthropic AI. In addition, Jeffrey is a Visiting Scholar at Stanford University, Chair of the Board of the Jeff Bleich Centre on Democracy and Disruptive Technologies at Flinders University, and serves on President Biden's National Security Education Board. In addition to these roles, Jeffrey has served as a Court-Appointed Special Master and Mediator in the United States District Court, Chief Legal Officer of Cruise LLC, Partner at Munger, Tolles & Olson LLP, and CEO of Dentons Diplomatic Solutions and Partner at Dentons international law firm. Jeffrey also clerked for the Chief Justice of the United States Supreme Court.

Jeffrey has served as Board Chair of Pacific Gas & Electric Company, Chair of the Fulbright Foreign Scholarship Board, Chair of the California State University Board of Trustees, and President of the State Bar of California. In addition, he has served as a Director of a number of charitable and public policy organisations including the the Australian American Leadership Dialogue, RAND Australia, Stanford University’s Center for Advanced Study in the Behavioral Sciences, Amherst College, the American Security Project, and Futures Without Violence.

Jeffrey holds a Bachelor of Political Science from Amherst College, a Master in Public Policy from Harvard University, and Juris Doctor from UC Berkeley, along with honorary doctorates from San Francisco State University, Griffith University, and Flinders University.