Dr Kass joined OHB (Orbitale Hochtechnologie Bremen) System when it was still a small company in Bremen, Germany, with less than two dozen employees, at a time when most of its contracts came from German government sources. With his proposal to the European Space Agency in response to a call to conduct a study on Columbus Crew On-Board Tasks, he won the first proposal for the company with ESA against half a dozen European consortia encompassing all the major aerospace companies in Europe.
He continued supporting ESA with studies, participating in expert working groups, and auditing third party work and simulations, all in the domain of human spaceflight. He supported the Directorate of Human Spaceflight & Microgravity at ESTEC as well as ESA’s offices in Toulouse on work with the design of ESA’s HERMES space plane, in the domain of human factors and the HERMES cockpit. He also worked on the design of the Crew Training Centre at the DLR, Cologne, which was to become ESA’s Astronaut Centre (EAC). He organized and participated in parabolic flight campaigns with ESA’s zero-G aircraft and with the Russian Gagarin Cosmonaut Training Center’s Ilyushin Il-76MDK.