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Samuel I. Schwartz, a.k.a. Gridlock Sam, is an American transportation engineer, most notable for popularizing the phrase "gridlock". Educated at Brooklyn College (BS Physics) and the University of Pennsylvania (MSCE), he originally worked as a New York City cabbie. He served as NYC Traffic Commissioner from 1982 to 1986 and when the traffic department became subsumed by the Department of Transportation held the second-in-command post of First Deputy Commissioner and Chief Engineer from 1986-1990. He started his own firm.
He writes columns for New York City's Daily News, lower Manhattan’s Downtown Express, The Queens Chronicle and in the Yiddish News Report as Gridlock Shmuel. He answers questions by mail and alerts readers about traffic and transit patterns. He also blogs for PBS and Engineering News-Record.
- Renn, Aaron M. (June 1, 2016). "When New York City tried to ban cars – the extraordinary story of 'Gridlock Sam'". The Guardian. ISSN 0261-3077.
- Official Gridlock Sam website
- Sam Schwartz' consulting firm
- Traffic article on New York's Daily News
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