Michael Grünberger  Michael Grünberger is an Austrian luger and skeleton racer who competed during the 1990s. As a skeleton athlete, he won two medals in the men's event at the FIBT World Championships with a gold in 1990 and a bronze in 1990. His best finish in the Skeleton World Cup was second twice in the men's event (1990-1, 1995-6). Grünberger's only World cup victory in luge took place in Igls in 1990.