Voice Over training with George McGrath, he wrote the first season of Pee-Wee Playhouse and Tracy Ulman characters among other things.
RP and General American training along with IPA and phonetics at the New York Film Academy.
Accent training at King Richards Renaissance Faire, different social classes accents.
I served in the military for four years as a fire fighter where i worked in the dispatch center for several months at a time and had to have a certain level of commitment to remaining calm and collective when calls come in as well as experiencing many different characters on the other end of the phone in various mode of panic. These type of voices can only be expressed through true experience.