Charles Henry Janin (1873-1937), son of Louis Janin and Elizabeth (Marshall) Janin, was a California mining engineer, who followed the career of his famous father. He began his professional life by working with his father, then established the firm of Janin, Stebbins & Smith (later Janin & Smith) until 1911, when he began working alone. In 1914 he joined the staff of the U. S. Bureau of Mines in Washington D. C., and participated in war work with that bureau during World War I, serving on the advisory committe on tin resources, as a member of the Gold Committee, and was instrumental in securing for the U. S. from Siberia, a large shipment of platinum, a very scarce and highly strategic element during the war years.

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