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The SSDI has a Gregory Mangin of New Jersey, born November 1, 1907, dying October 1979, which seems to be him (his birth year is 1907 per this book). There is, however, an article (I can't link directly to it) in Google News Archive called "Gregory Mangin, 89; tennis master, teacher" from The San Diego Union Tribune, dated April 29, 1998, which looks like an obituary from the title. Obviously in this case I would go for the obituary over the SSDI, since the former would be the more reliable source, but I can't read enough of it to confirm that it is an obituary (and not, say, a "retrospective 90 years later" or something silly like that). If anyone can access the article, it would probably confirm his date of death. Regardless, he is deceased one way or another, so I have changed the BLP category. CanadianPaul20:28, 16 November 2012 (UTC)[reply]