My experiencs have all been in the broadcast industry from radio to television and back to radio... Given the opportunity I accept any challenege of voices and am always fascinated with getting better at speaking in genral and doing cartton voices for people... Plus I am also a stand up comedian on the side when I have the time and give me chances to practice...
My training included college from University of Nebraska-Omaha theatre classes in voice and voice over work.. Plus working with a voice coach and doing lots of radio and theatre work with other terrific talented people..
I think the art of voice overs is a matter of u continureing to learn from people and getting the best out of people in anyway possible... The more u practice at something the better u get at it... I feel for me the broadcast industry has help me out when asking the right questions...