2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). - Active in East Greenbush, New York, 1970; active in 1988. Sources: American Guild of Organists: program from 1970 National Convention, 50. Stephen Pinel. Elizabeth Towne Schmitt.
2018-05-07/2019-02-11 - From Organ Database Builders editor Charles Eberline, May 6, 2018. - Dunn and Bradstreet Business Directory indicates the business was established in 1956. Carlson has a FaceBook page for his business that is active as of May 2018. Sources: Dunn and Bradstreet, https://www.dandb.com/businessdirectory/leonardcarlson-eastgreenbush-ny-69562.html Carlson Organs (FaceBook), https://www.facebook.com/pg/CarlsonOrgans/about/?ref=page_internal.
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