Lachman was born in Brooklyn, New York in 1930 and grew up in Jersey Homesteads, New Jersey, and attended Upper Freehold Township High School (later renamed Allentown High School).
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In addition to Irwin Lachman, the team consisted of engineer Rodney Bagley and geologist Ronald Lewis.
Irwin Allen | Steve Irwin | Robert Irwin (artist) | Robert Irwin | Bill Irwin | May Irwin | Irwin Shaw | Irwin M. Jacobs | Lew Irwin | Irwin L. Jacobs | Harry Lachman | Bob Irwin | Irwin Cotler | Gary Lachman | Frederick Irwin | Irwin Levine | Clint Irwin | Stafford LeRoy Irwin | Richard Beebe in the original line-up of '''Lew Irwin and The Credibility Gap''' (left to right): John Gilliland | Joseph Oscar Irwin | John N. Irwin, II | Irwin Winkler | Irwin Jacobs | Irwin Hoffman | IRWIN | Irwin | Herbert Carmichael Irwin | Gary S. Lachman | Agnes Irwin School | Will Irwin, photo published in ''San Francisco Call |