Tom McMahon is currently a private investor with interests in a private finance company, real estate, an internet service provider and agriculture.
From 1994 to 2012 he was the vice president of operations for Barker Company, a manufacturer of custom refrigerated and hot display cases for supermarkets, convenience stores and food service operations. Prior to joining Barker Company in 1994, McMahon worked for Ernst & Young, LLC in Oklahoma City. He is a graduate of the University of Northern Iowa.
McMahon's community involvement includes serving on the Fairfield Community Recreation Project, the Iowa Association of Business & Industry Foundation, Leadership Iowa Board of Governors, Leadership Iowa University and S Corp Association of America – all of which he served as chair. He also served as treasurer of The Lord's Cupboard of Jefferson County and was past president of Greater Jefferson County Foundation.