Thomas Davis Klingenstein

Thomas Davis Klingenstein (born 1954) is an American hedge fund manager, a leading donor to the US Republican Party, and chairman of the board of trustees of the Claremont Institute, a conservative think tank, since 2010.

Early life He is the son of John Klingenstein and Patricia Davis Klingenstein (1929–2023). His grandfather, Joseph Klingenstein, was an investment banker, and co-founded Wertheim & Co., an investment firm.

Career Klingenstein is a partner in Cohen Klingenstein, a Wall Street hedge fund investment firm that administers a portfolio worth more than US$2.3 billion, as of 2023. Cohen Klingenstein was founded in 1981, and is principally owned by George M. Cohen and Klingenstein.

Klingenstein donated more than $10 million in the 2024 election cycle.

Personal life On 6 July 1986, Klingenstein married Nancy Deborah Perlman, daughter of Mr. and Mrs. Nathan Perlman of Tucson, Arizona, in Greenwich, Connecticut. They had two daughters together. Nancy died in 2018.