Clinton Williams "Clint" Murchison Sr. (April 11, 1895 – June 20, 1969)[1] was a noted Texas-based oil magnate and political operative.

In 1919 he joined lifelong friend Sid Richardson as a lease trader in the Burkburnett oil field near Wichita Falls, Texas.

[1] In the late 1930s, Murchison began diversifying his investments working with his sons, John Dabney and Clint Jr., who joined the business after World War II.

Holdings included New York Central Railroad, BB gun maker Daisy Manufacturing Company, Lionel Trains, Henry Holt Publishing, Field & Stream magazine, Heddon Rod & Reel, and Alleghany Corporation.

Delhi's Canadian subsidiary developed gas reserves in Western Canada leading Murchison to build the 2,100-mile Trans-Canada Pipe Lines completed in 1958.

Other political interests included farm legislation, a federal land bank, the milk industry, international trade, the gold system and the fight against Communism.

He used his influence as a major stockholder of Holt Publishing Company to urge publication of Hoover's book Masters of Deceit.

[2] Madeleine Duncan Brown, an advertising executive who previously claimed to have had an extended love affair and a son with President Lyndon B. Johnson, said that she was present at a party in Murchison's Dallas home on the evening prior to the assassination of John F. Kennedy that was attended by Johnson as well as other famous, wealthy, and powerful individuals including J. Edgar Hoover, Richard Nixon, and H. L.

That’s a promise.”[10][nb 1] Brown's story received national attention and became part of at least a dozen John F. Kennedy assassination conspiracy theories.