https://en.wikipedia.org/wiki/Dr_phil#Education_and_early_career

Show is based on him. He's got one shit PHD after writing nothing useful about rheumatoid arthritis. Everything in this show is retarded and fake as fuck. Its a dumbfuck ripoff of Lie To Me with worse actors and a Dr Phil connection.

I've only caught bits and pieces of the show - so I apologize if this is explained. Online I can only find reference to Bull holding 3 PhD degrees.

Obviously one of them is in a branch of Psychology (Industrial/Organizational [IO] Psychology, or maybe Clinical]), do they give any insight into the other two?

Bull's PhDs