Still alive and broadcasting, though his show has nowhere near the syndication range it enjoyed in its heyday and is mostly internet broadcast now:
Growing up, I remember listening to the Doc live on KMET in Los Angeles for four full hours each Sunday night, 6-10pm. Called in requests and for contests many times. His Halloween and Christmas shows were always a highlight, as well as the year-end Top ## countdown.
Live long and prosper, Barry!