Haskell Robert Sadler, also known as Cool Papa Sadler (April 16, 1935 — May 6, 1994)[1] was an American blues singer, songwriter, and guitarist.
Born in Denver, Colorado,[1] Sadler played a number of times at the San Francisco Blues Festival. He was one of the members of the San Francisco Bay Area blues scene from the 1960s through to the 1990s. Sadler wrote "747" as recorded by Joe Louis Walker.[1]
He died in Berkeley, California in 1994.[1]