Oscar Onken (1858 – 1948) was an American entrepreneur. He was professionally active in Ohio. Onken was a prominent businessman and philanthropist. Impressed with the Gustav Stickley and Austrian stands at the 1904 St. Louis ‘Louisiana Purchase Exposition,’ he founded The Shop of the Crafts in Cincinnati in 1904.
In 1934, he worked in the Indian office of American architect Antonin Raymond. In 1937, in the Tokyo office, he studied Japanese carpentry techniques. In 1941, he set up his first workshop in Seattle. In 1942 in Idaho, Nakashima studied with an old Japanese carpenter until Antonin Raymond arranged his release.