Claus Yding Andersen is Professor in human reproductive physiology at University of Copenhagen and has since 2009 been heading the Laboratory of Reproductive Biology at the University Hospital of Copenhagen, Denmark. He qualified first as a Master of Science and is then earned a Doctorate of Medical Science from University of Copenhagen. He was a member of the team which introduced IVF to Denmark in the mid 1980s and has worked in reproduction since then. He leads a national program for cryopreservation of human ovarian tissue and his major research interests include ovarian endocrinology and human embryonic stem cells. He has published more than 300 peer-reviewed papers and has given numerous international presentations.