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In page Cleary Gottlieb Steen & Hamilton:

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The firm was founded in 1946 when six partners from the firm of Root, Clark, Buckner & Howland left to found a firm which they initially called "Cleary, Gottlieb, Friendly, & Cox." One of those partners was Henry Friendly, whose name was removed from the firm's name after he was appointed as a judge on the United States Court of Appeals for the Second Circuit in 1959. Melvin Steen was among the founding partners.