He started studying mathematics and physics at the University of Copenhagen in 1963 and after a year he was hired as an instructor of mathematics – the same course that he was following himself. In ’69 he received his Master’s in astronomy and was awarded a gold medal for his thesis. This led to a three year research grant and it meant he could study anywhere in the world he wanted to. Johannes Andersen is an associate professor of astronomy at the Niels Bohr Institute. He has had 50 busy years with stars, telescopes and international collaboration