John is a senior research fellow at CEPR, where he was a senior economist between 2005 and 2015. He later worked as the Research Director at the Washington Center for Equitable Growth and the Vice President of the Economic Policy Institute.

He has published peer-reviewed research on a range of labor market issues including unemployment, wage inequality, the minimum wage, unionization, immigration, technology, racial inequality, mass incarceration, and other topics. His research has been cited widely in the media including The Economist, The New Yorker, The New York Times, and The Wall Street Journal.

His popular writing has appeared in The American Prospect, Boston Review, BusinessWeek.com, Challenge, Democracy, Dissent, The Guardian, The International Herald Tribune, Salon, The Washington Post, and other publications. Schmitt co-authored three editions of The State of Working America and co-edited Low-Wage Work in the Wealthy World (Russell Sage Foundation, 2010).

From 1999 through 2015, he was a regular visiting professor in public policy at the Pompeu Fabra University in Barcelona. In the 1990s, he was a Fulbright scholar at the University of Central America in San Salvador, El Salvador, and later worked as an information officer for the United Nations Peacekeeping Mission in El Salvador (ONUSAL).

He has a Ph.D. and an M.Sc. in Economics from the London School of Economics and an A.B. in Public and International Affairs from Princeton University.