|Birth name||Haskell Robert Sadler|
|Also known as||Cool Papa|
|Born||April 16, 1935|
Denver, Colorado, United States
|Died||May 6, 1994 (aged 59)|
Berkeley, California, United States
|Occupation(s)||Singer, songwriter, guitarist|
|Instruments||Human voice, guitar|
Born in Denver, Colorado, United States, Sadler moved to California and worked in clubs in the San Francisco Bay Area starting in the 1960s. He played a number of times at the San Francisco Blues Festival. Sadler wrote "747" as recorded by Joe Louis Walker, and "Yesterday" recorded by Tiny Powell. In the 1970s, he recorded as "Cool Papa" for TJ Records. Cool Papa proved to be a guiding hand to Gene "Birdlegg" Pittman, then a new arrival in the Bay Area, and Pittman played alongside Sadler for 13 years.
- Eagle, Bob; LeBlanc, Eric S. (2013). Blues - A Regional Experience. Santa Barbara: Praeger Publishers. p. 345. ISBN 978-0313344237.
- Herman, Michael (November 7, 2004). "Jokin' On The Harp Player" (PDF). Hawkeyeherman.com. Retrieved 12 January 2015.
- Doc Rock. "The Dead Rock Stars Club 1994 - 1995". Thedeadrockstarsclub.com. Retrieved 2017-01-28.
- Mike Stephenson. "From The Vaults... Gene "Birdlegg" Pittman" (PDF). Bluesandrhythm.co.uk. Retrieved 2017-01-27.
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