- Great-grandfather of Armie Hammer and Viktor Hammer.
- Industrialist, art collector and philanthropist.
- Chairman and CEO, Occidental Petroleum.
- He was the son of Rose (Lifschitz) and Julius Hammer, Russian Jewish immigrants. His family was from Odessa.
- He described his father as "an American Bolshevik".
- One of the very first American businessmen to do business with Russia after the 1917 revolution. He was personally acquainted with Vladimir Ilyich Lenin.
- Described by Gore Vidal as "one of the twentieth century's more gorgeous criminals".
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