Marvin Neil Simon was born on 04 Jul 1927 in the Bronx, New York City, New York to Jewish parents, Mamie (Levy) and Irving Simon. He had one older brother by 8 years, television writer and comedy teacher Danny Simon. He grew up in Washington Heights, Manhattan, NY during the period of the Great Depression. As a child, he chose to go by the given name of Neil. 
He was an American playwright, screenwriter and author. He wrote more than 30 plays and nearly the same number of movie screenplays, mostly adaptations of his plays. He received more combined Oscar and Tony nominations than any other writer.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X76S-154 : accessed 28 August 2018), Marvin Simon in household of Irving Simon, Bronx (Districts 251-500), Bronx, New York, United States; citing enumeration district (ED) ED 443, sheet 4B, line 86, family 93, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1478; FHL microfilm 2,341,213.
"United States World War II Army Enlistment Records, 1938-1946," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:K8PD-6S9 : 5 December 2014), Marvin N Simon, enlisted 08 Aug 1945, New York City, New York, United States; citing "Electronic Army Serial Number Merged File, ca. 1938-1946," database, The National Archives: Access to Archival Databases (AAD) (http://aad.archives.gov : National Archives and Records Administration, 2002); NARA NAID 1263923, National Archives at College Park, Maryland.