Anders Petter Larson established the A.P.Larson Company Inc. in New York in 1940/41, and built up a successful import/export business dealing in steel and other metals, cork, chemicals, and wire and cables. Member and Officer of the Danish, Swedish and Norwegian Chambers of Commerce, and of various governmental committees concerning strategic commodities during World War II.
After WWII, held export agencies for American companies dealing in similar products to those handled by the A.P.Larson Company.