Johan Heinrich Lange Koch was born December 8, 1874 in Breman, Germany the son of Fredrick Lange and Anne Margarethe Koch. Orphaned at an early age he was raised by his uncle Johan Gerd Koch. He adopted his mother's maiden name as was the custom when no male heirs existed in a line to perpetuate the name. He was thereafter known as John Henry Cook.

John Henry Cook was married in 1909 to Marietta Ida Porter. Their three children were: John Francis, Margaret Porter, and Ida Janet Cook.

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