Hansruedi came to ETH more than 40 years ago as a young technician, with the intention to move on the next year. However, different from his original plan he enjoyed the environment at ETH, in particular the collaboration with highly motivated students and professors, so much that he continued working at the Physics Department until his retirement in 2008. Even after his retirement he carried on to support the activities of our group with his great experience on a part-time basis until March 2013.