Johann Heinrich Wilhelm Geißler (May 26, 1814 in Igelshieb – January 24, 1879) was a skilled glassblower and physicist, famous for his invention of the Geissler tube, made of glass and used as a low pressure gas-discharge tube.Geissler descended from a long line of craftsmen in the Thüringer Wald and in Böhmen. He found work in different German universities, eventually including the University of Bonn.