West Virginia » Potomac Highlands » Randolph County » Helvetia » Dr. Hanz Gruber House Dr. Hanz Gruber House Details c. 1900. Southwest side of Gruber Rd. Originally a square, four-room frame house, to which several additions have been made, this was the home of the community doctor. Gruber was a nephew of Franz Gruber, the Austrian composer of “Stille Nacht, Heilige Nacht.” Writing Credits Author: S. Allen Chambers Jr.