I missed it, but his name is Grant Paulsen. His show "Minors and Majors" airs on SiriusXM MLB Network Radio on Sunday mornings at 8:00, and he occasionally fills in on other shows throughout the week. You're right, he really knows his stuff and he's a local guy (just recently graduated from GMU, I believe).
Thanks, I'ma see whether or not his show is available online or in podcast format or something... I'm not a Sirius subscriber. But yeah he was articulate and his enthusiasm was contagious.