Trenchard was born on December 13, 1863 in Centreton, Pittsgrove Township, Salem County, New Jersey, the son of William B. and Marie G. Trenchard. He graduated South Jersey Institute in 1882 and was admitted to bar in 1886. He practiced at Bridgeton, New Jersey, where he also acted as City Solicitor from 1892-1899. He was Member House of Assembly in 1889 and Republican presidential elector in 1896. He married Harriet M. Manning on November 17, 1891. They resided in Bridgeton.
He was appointed law judge of Cumberland County by Governor of New Jersey Foster McGowan Voorhees in 1899 and reappointed by Governor Murphy in 1904. He was appointed Justice of Supreme Court on June 8, 1906 to fill a vacancy and for full term on January 15, 1907. He is well known for being the presiding judge in the high-profile trial of Richard Hauptmann for the Lindbergh kidnapping. He retired in 1941.
- List of Justices of the Supreme Court of New Jersey
- New Jersey Court of Errors and Appeals
- Courts of New Jersey
- Birkner, Michael J.; Linky, Donald; Mickulas, Peter (10 February 2014). "The Governors of New Jersey: Biographical Essays". Rutgers University Press. Retrieved 26 June 2016 – via Google Books.
- "South Jersey judge presided over Lindbergh Kidnapping Trial". Retrieved 26 June 2016.
- Hauptmann Trial Judge Retires in Jersey at 77 January 25, 1941, The New York Times
- Rites for Ex-Judge Trenchard -Former Supreme Court Justice Thomas W. Trenchard, who sentenced Bruno Richard Hauptmann to the electric chair, The New York Times, July 28, 1942
- Falzini, Mark W. (1 November 2008). "Their Fifteen Minutes: Biographical Sketches of the Lindbergh Case". iUniverse. Retrieved 26 June 2016 – via Google Books.
- "Thomas Whitaker Trenchard (1863 - 1942) - Find A Grave Memorial". Retrieved 26 June 2016.
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