- B.S. West Virginia University, 1981
- M.A. Fuller Theological Seminary, 1989
- M.A. University of Notre Dame, 1990
- Ph.D. University of Notre Dame, 1994
Professor Wigger's research interests focus on American religious and cultural history.
PTL: The Rise and Fall of Jim and Tammy Faye Bakker's Evangelical Empire. Oxford University Press. 2017
American Saint: Francis Asbury and the Methodists. Oxford University Press, 2009.
Taking Heaven by Storm: Methodism and the Rise of Popular Christianity in America, 1770-1820. Oxford University Press, 1998; paperback, University of Illinois Press, 2001.
Methodism and the Shaping of American Culture, co-edited with Nathan Hatch. Kingswood Books, 2001.