He was the brother of U.S. Senator John Slidell of Louisiana, who was later involved in the American Civil War's "Trent Affair."
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Mackenzie was captain of the USS Somers when it became the only U.S. Navy ship to undergo a mutiny which led to executions, including Philip Spencer, the nineteen-year-old son of the Secretary of War John C. Spencer.
John Slidell was a brother of Alexander Slidell Mackenzie, a naval officer who commanded the USS Somers on which a unique event occurred in 1842 off the coast of Africa during the Blockade of Africa.
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Alexander Slidell MacKenzie (1842–67), an officer in the United States Navy during the American Civil War and his brother General Ranald S. Mackenzie.