Richard King Mellon (June 19, 1899 – June 3, 1970), commonly known as R.K., was an American financier from Ligonier, Pennsylvania.
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The son of Richard B. Mellon, nephew of Andrew W. Mellon, and grandson of Thomas Mellon, he and his sister Sarah Mellon Scaife and cousins Paul Mellon and Ailsa Mellon-Bruce, were heirs to the Mellon fortune, which included major holdings in Mellon Bank, Gulf Oil, and Alcoa. In 1957, when Fortune prepared its first list of the wealthiest Americans, it estimated that the four cousins were all amongst the richest eight people in the United States, with fortunes of between 400 and 700 million dollars each.
Mellon served in the United States Army in both world wars and remained active in the United States Army Reserve, receiving the Distinguished Service Medal and rising to the rank of Lieutenant General.
He is chiefly remembered for his urban renewal efforts in Pittsburgh, undertaken in an unlikely partnership with postwar mayor David L. Lawrence. After returning to the city after World War II, Mellon developed an interest in improving Pittsburgh's severe flooding, pollution, and urban blight. Under the auspices of the Allegheny County Community Development Association, massive demolition and redevelopment projects transformed the city, backed politically by Lawrence and financially by Mellon and his companies. Mellon also used his economic power to push companies and landowners to comply with new regulations.
He married Constance Prosser McCaulley, daughter of a New York banker, in 1936. They had four children: Richard P. Mellon, Seward Prosser Mellon, Constance Barber Mellon, and Cassandra Mellon Milbury. Richard King Mellon was also the primary financial founder of Carnegie Mellon University's Heinz College, then known as the School of Urban and Public Affairs.