As he notes in a 2001 interview, during this period Gaddes sought out and became instrumental in developing the careers of young singers: I've been very active in the careers of Frank Lopardo who is singing "Edgardo" in Lucia di Lammermoor.
After leaving Opera Theatre of Saint Louis, Gaddes became President of Grand Center of St. Louis, a midtown performing arts district and served as its President until 1994.