The recipient of numerous honors and awards, Gaddes has been cited by Mu Phi Epsilon music fraternity, St. Louis Chapter of the Public Relations Society of America Lamplighter Award, and as the first annual Missouri Arts Award honoree, the Human Relations Award of the St. Louis Jewish-American Committee, National Institute for Music Theatre Award and Young Audiences' Cultural Achievement Award. He has received honorary doctorates from St. Louis Conservatory and Schools for the Arts, University of Missouri and Webster University. He has been honored by the Mayor of Santa Fe for his contribution to the arts, and by "New Mexico Business Weekly" as one of the 2005 “Top 10 Power People in the Arts.”.