One of two small presses:

(1) Ziesing Brothers, a small press located in Willmantic, CT owned and operated by Michael Ziesing and his brother Mark V. Ziesing. It was somewhat of a specialist in the works of Gene Wolfe, but published other hot young writers as well. When Mark Ziesing moved to California, Michael Ziesing left the business which became:

(2) Mark V. Ziesing, which succeeded Ziesing Brothers in 1989 and is owned and operated by Mark V. Ziesing.

Wikipedia ISFDB https://www.ziesings.com/ (IA) Website