From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). —

Born 1936 in Veenendaal, Netherlands; with his father; with Fredrich Weigle of Echterdingen, West Germany; immigrated to Canada, 1974; established a firm in Chilliwack, British Columbia, Canada, 1979; active in 1985.

Source: Correspondence of David H. Fox.

Mr. Koppejan also had a U.S. entity so that he could build for the U.S. Market According to the bizapedia.com website:

Company Name: KOPPEJAN PIPE ORGANS (U.S.A.), INC.
Entity Type: WA PROFIT CORPORATION
File Number: 601727890
Filing State: Washington (WA)
Filing Status: Inactive
Filing Date: July 25, 1996
Company Age: 25 Years, 7 Months
Registered Agent: Jacob L Smith
105-5th St Ste 201 PO Box 632
Lynden, WA 98264
Expiration Date: July 31, 2002
Governing Agency: Washington Secretary of State