Lagon is the Chief Policy Officer at Friends of the Global Fight Against AIDS, Tuberculosis, and Malaria and a Distinguished Senior Scholar at Georgetown University's School of Foreign Service.

[2] Lagon later published his dissertation as a book called The Reagan Doctrine: Sources of American Conduct in the Cold War’s Last Chapter (Praeger, 1994).

[5] In 2007, Lagon was nominated by President George W. Bush to serve as the U.S. Ambassador-at-Large to and Director of the Office to Monitor and Combat Trafficking in Persons.

[8] In 2015, he was appointed President and CEO of Freedom House, a non-governmental organization that researches, advocates for, and assists the promotion of democracy and human rights globally.

Lagon has written a variety of pieces on behalf of Friends of the Global Fight Against AIDS, Tuberculosis and Malaria.