Alley was born in Winnemucca, Nevada, and played football in high school and college. His brother, Eddy Allen, was a drummer; they played together often. Vernon played with Wes People in 1937 and with Saunders King (whose band was interracial) until the end of the decade. He briefly led his own band in 1940.
Around 1940, while in Lionel Hampton's band, Alley switched from double bass to electric upright bass, one of the first musicians to do so. In 1942 he moved to Count Basie's ensemble, where he played only for a few months and appeared in the film Reveille with Beverly.
Alley enlisted in the U.S. Navy as a musician in 1942 and after training at Camp Robert Smalls, he was assigned as part of a 45-piece regimental band to the Navy's PreFlight School located at St. Mary's College, in Moraga, California. Others who served in this band included Ernie and Marshall Royal, Jackie Kelso, Wilbert Baranco, Earl Watkins, and Buddy Collette.
After returning to civilian life, Alley put together an ensemble in San Francisco. He continued to play there and was an active member on local radio and in civic arts into the 1990s. He died there in 2004, having become "the most distinguished jazz musician in San Francisco history." 
- Royal, Marshal, with Claire P. Gordon. Marshal Royal: Jazz Survivor. London: Cassell, 1996.
- Selvin, Joel and Peter Fimrite. "Vernon Alley, 1915-2004." San Francisco Chronicle. SFGate. 5 Oct. 2004. Web. 25 July 2014.
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