J. Hartwell Hillman, Jr.

John Hartwell Hillman (1880–1959) was an American businessman, active in coal, steel and gas.

John Hartwell Hillman was born in 1880, the son of J. Hartwell Hillman Sr. and Sallie Murfree Frazer.

J. Hartwell Hillman headed his family company, J. H. Hillman & Sons, in partnership with his brothers Ernest Hillman (1883–1969) and James Frazier Hillman (1888–1972). Eventually, this became Pittsburgh Coke & Chemical, and is now Calgon Carbon.

In 1919, Hillman bought a late-1870s red brick, three-storey house in "Millionaires' Row" on Fifth Avenue, Pittsburgh, built for James Rees a boat and engine builder. He engaged the architect Benno Janssen to build a new house, but changed his mind and had Edward Mellon remodel the house, encasing it in limestone, and renaming it "Hillman House". It stayed in the family until 1975.

He married Juliet Cummins Lea (1885–1940).

His son John Hartwell Hillman III was in the Princeton class of 1932, and president of the National Garden Supply Corporation, and died on March 21, 1974 of heart failure at his Pittsburgh home.

His son Henry Lea Hillman (1918–2017), was a billionaire investor.

Hillman died in 1959.

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