After he completed his PhD Dr Kass joined the Max-Planck Institute to research in Nuclear Physics. Starting a career of more than 30 years in human spaceflight, he worked as a scientist at the department of medicine at Joh.-Gutenberg University, Mainz, Germany, where he researched in Neurophysiology and space medicine, particularly in the area of sensory perception. This work was carried out in conjunction with two Spacelab missions, Spacelab-1 and Spacelab-D1.
