Johnson's academic research and writing have been concentrated in the area of political economy and public policy. He is the author and co-author of six books and has published over 50 articles in academic journals and other publications. In addition to his writings, Johnson has edited a professional journal, and served on three presidential and congressional commissions. He also is currently Chairman of the Board of The National Sporting Library and Museum and serves on the board of directors of the Morgan Stanley Funds Group, and NVR Inc.