Bob Einstein, a two-time Emmy winner who has recurred on HBO’s Curb Your Enthusiasm since its launch and created the wacky Super Dave Osborne character, died today in Indian Wells, CA. He was 76 and recently had been diagnosed with cancer.

Best known to today’s viewers for playing the serious, often surly but always hilarious Marty Funkhouser on Curb, Einstein was a foil for its creator-star Larry David. He appeared in nearly two dozen episodes of the series dating from 2004 to the most recent season.

Einstein’s younger brother, actor-director Albert Brooks, tweeted today, “R.I.P. My dear brother Bob Einstein. A great brother, father and husband. A brilliantly funny man. You will be missed forever.”

A comedian’s comedian, Einstein first made his name as a writer. His career dates to the 1960s, when he won his first Emmy as part of the writing team for The...