From Builders editor Stephen Hall, June 21, 2018. --
Humpe Organ Company is a privately-held company located in Richmond, Ohio. The company is engaged in service of existing and building new pipe organs. It was established in 1961 by Joseph Humpe, owner.¹

The most recently recorded activity in the database by this builder was in 1990. Current status of the company is unknown. [this information is out of date and incorrect -- Paul Marchesano, 15 Dec 2021]
Source:

1. "Humpe Organ Company", Dun & Bradstreet Business directory, https://www.dandb.com/businessdirectory/humpeorgancompany-richmond-oh-4340003.html.

October 30, 2004:
From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). —

Joseph E. Humpe. Active in Richmond, Ohio, ca. 1980s; active 1991.

Staff: Joseph G. Zamberlan.

Sources:
The American Organist March 1991 (New York: American Guild of Organists), 50.
Joseph G. Zamberlan.

According to Mr. Humpe's Facebook page, he has retired. "Former Owner at Self employed pipe organ builder"