Dr. T ASMR is the man behind the channel of the same name. He also roleplays as all the other characters that have speaking roles.
He's about 45 and said in his 300k livestream that his first name is "Jay"; he is from Lowell, Massachusetts.
He has said that he works in the construction business and enjoys playing video games in his spare time and runs a separate gaming channel.
He used to be a machinist, and he uses machines to produce precision cut metal props for his videos.
During one of his videos, Dr. T mentions how Professor Tinglebottom was trying to gain control of the channel from him. That being said, it seems that Dr. T and the characters can interact, somewhat.
- The first word spoken on the channel was "hello", and came from Dr. T himself in ASMR Droid Repair-- the first roleplay video Dr. T ever made.