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

Succeeded firm of Bert Keates; partnership of Bert Keates and Dieter Geissler in Acton, Ontario, Canada, 1972; Keates retired in 1971; firm active in 1988.

Source:

• Letter to David H. Fox.

 

From Organ Database Builders editor Stephen Hall, July 1, 2018. -

The company was established 1945 in London Ontario by Bert Keates. In 1951, the company acquired the assets of the Woodstock Organ Company (formerly Karn-Warren) and in 1969 the JC Hallman company was added. In 1971 Dieter Geissler took over as President following Mr. Keates' retirement. In 2010 Dieter Geissler retired leaving the company in the hands of Jens Geissler .

Sources:

• Keates-Geissler Pipe Organs Ltd, accessed September 20, 2015, http://pipeorgans.ca/.
• Canadian Encyclopedia.