I don't know -- but would you please give experiences and thoughts on JT?
He is a "confident" man. Some would say obnoxious. I would say, borderline case. I have never ordered from him, for a number of reasons. I haven't been to his shop in around 8 years, but the last time I was there, I was impressed by the quality of the work, especially the handwork.
And does he have a house style?
Old Hollywood. Wide, pitched shoulders. Nipped waist. Clean front (achieved in part with a stiffer than average horsehair canvas chest piece).
And who is the most Ivy League tailors out in Los Angeles -- if such a thing exists in LA?
I haven't lived there in a while. Still, I did my research when I did. I don't think such a thing exists. Carrol & Co. is a very "trad" shop, however. I'm sure they carry more than one American MTM, like Oxxford or Southwick.