found: Being there, 1979:credits (editor, Don Zimmerman)
found: Coming home [MP] 1978:credits (film editor, Don Zimmerman; film is about veterans)
found: Internet movie database, June 22, 2020(Don Zimmerman; film editor; editor of Coming home (1978), Being there (1979), RED 2 (2013); father of film editors, Dean Zimmerman, Dan Zimmerman, and David Zimmerman)
found: U.S. Public Records Index, 1950-1993, Volume 1, viewed June 22, 2020 via Ancestry.com(Donald P. Zimmerman; born June 15, 1944; residence, Los Angeles, California)