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Einstein was born in Los Angeles in 1942. His parents were the comic Harry Einstein, best known for playing the character Parkyakarkus on radio and in the movies, and the actress-singer Thelma Leeds. His younger brother is comedian and writer Albert Brooks (born Albert Lawrence Einstein), and his older brother, Cliff Einstein, is a retired advertising executive in Los Angeles.
On the November 12, 2009, edition of TNA Impact!, he was the booker of the night. He has made a four-episode sketch series Super Dave's Spike Tacular on Spike TV, reprising his Super Dave character, once again engaging in outrageous stunts.
Einstein appeared on the second season of Anger Management as Charlie Goodson's very angry neighbor, and his character in the show instantly got an unflattering nickname based on a feminine hygiene product.
Einstein has voiced two characters from The Life & Times of Tim, playing the Elephant Trainer in Tim & the Elephant in the second season, and the bookie in Pray for the Jets in the third.