If I'm not mistaken, wasn't Jack Mickievicz's shop in Douglassville, Berks County, PA?
I unfortunately never met the man, but here is a bio compiled from Angler Sport Group and elsewhere:
Jack Mickievicz started commercial tying at the age of 12, and later opened a fly shop in 1968. He developed the spring wire bobbin in 1969, wing burners in 1970, co-designed the Renzetti presentation vice and introduced prepared dubbing to the fly tying market somewhere in the early 70s.
Jack promoted many common sense improvements to tying tools such as hex handles so they would not roll off the table. He often commented, “Tying tools weren’t very good in those days.”
He was always an advocate for substitution of endangered and threatened species saying, “I don't appreciate the logic in being a member of conservation organizations like TU and FFF and touting “Limit your kill, don’t kill your limit while insisting on Indian crow, polar bear and baby seal for your flies.”
Jack was one of the founders of the Dame Juliana League Fly Fishing Federation in 1971. He wrote for **** Surette and The Fly Tyer magazine in its early days, was an accomplished rod maker in both bamboo and graphite rods and taught both rod building and fly-tying workshops regularly.
Jack Mickievicz passed away on April 18, 2021 at the age of 80.