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Insight Horizon

Spencer Treat Clark

Author

Emily Cortez

Updated on March 12, 2026

Spencer Treat Clark – “Glass” New York City Premiere – Arrivals – SVA Theater – New York City, NY, USA, 2019 – Keywords: Thriller, Drama, Suspense, Action, The Sixth Sense Orientation: Portrait Face Count: 1 – False – Photo Credit: Michael Sherer / PRPhotos.com

Place of Birth: New York City, New York, U.S.

Date of Birth: September 24, 1987

Ethnicity: English, Irish, German

Spencer Treat Clark is an American actor. He is known particularly for co-starring in the films Unbreakable and Glass.

His sister is playwright and actress Eliza Clark. Eliza is married to Zack Whedon, the brother of filmmaker and television creator Joss Whedon.

Spencer’s paternal grandfather was Charles Elias Clark (the son of Charles Edward Clark and Dorothy Estelle Gregory). Spencer’s grandfather Charles was born in New Haven, Connecticut, and was a Yale Law School Professor Emeritus and master of Silliman College. Spencer’s great-grandfather Charles Edward Clark was born in Woodbridge, Connecticut, and was Dean of Yale Law School, from 1929 to 1939, Judge of the U.S. Court of Appeals for the Second Circuit, from March 9, 1939 to December 13, 1963, and Chief Judge of the U.S. Court of Appeals for the Second Circuit, from 1954 to 1959. He was the son of Samuel Orman Clark and Pauline Caroline Marquand/Marquart, who was of German descent. Spencer’s great-grandmother Dorothy was the daughter of Louis Le Grande Gregory and Grace B. Spencer.

Spencer’s paternal grandmother is named Ann Atkins.

Spencer’s maternal grandfather was Richard Thomas Pratt (the son of Richard William Pratt and Mary Agnes Cowan). Spencer’s grandfather Richard was born in Illinois. Spencer’s great-grandfather Richard was the son of Richard Pratt, of London, England, and of Anne Madigan, from Ireland. Mary was the daughter of Thomas Joseph Cowan and Susie McSoley, who were of Irish descent.

Spencer’s maternal grandmother was Bette Theresa Peterhans (the daughter of Louis Stanley Peterhans and Bessie Walsh). Bette was born in Illinois. Louis was born in Georgia, to German parents, Ludwig Peterhans and Therese Bach. Bessie was the daughter of James Walsh, who was of Irish descent, and of Elizabeth Cornell, who was from Canada.

Source: Obituary of Spencer’s paternal grandfather, Charles Elias Clark –