From the Social Security Death Index: JOHN PIERSALL 22 Jun 1923 Mar 1968 90801 (Long Beach, Los Angeles, CA) (none specified) 564-26-1273 California You can get his SS application from the SS Administration for a fee. On it you should find his place of birth and his parents names. From California Death Index:
Last Name First Name Middle Birth Date Mother Maiden Father Last Sex Birth Place Death Place Residence Death Date SSN Age Record PIERSALL JOHN E 06/22/1923 BEARD M CALIFORNIA LOS ANGELES(70) 03/23/1968 564-26-1273 44 yrs
You should be able to get a copy of his death record from the State of California. This also suggest you should be able to find him with his parents on the 1930 California Census.