His firm’s clients have included the Civic Democratic Party in the Czech Republic, President Goodluck Jonathan and the People’s Democratic Party of Nigeria, U.S. Sen. David Vitter (R-LA), Congresswoman Mary Bono Mack (R-CA), talk radio host Martha Zoller, and numerous elected officials. The firm has also represented in various capacities a variety of non-profit and commercial organizations.

Hartman has been a guest lecturer at William Carey University and Tulane University and before the Conservative and Reformist Caucus of European Parliament, and a featured speaker at numerous Republican Party events in Louisiana. He has been a member of the St. Tammany Republican Parish Executive Committee since 2004 and is a lay preacher at the Metropolitan Community Churches of New Orleans and Baton Rouge. He has authored four plays, and recently published his first book about his church.