Prof Klaus Hermann Rolf Diedrich received his Ph. D. in obstetrics and gynaecology in 1981. Since then he has been, first consultant at the department of OB/GYN of the university clinic of Bonn, founding member of the European Society of Human Reproduction and Embryology (ESHRE) and held the offices of secretary, chairman-elect and president of (ESHRE). Prof Diedrich is a Fellow of the Royal College of Obstetrics and Gynecology and vice-president of the Foundation of the German-Greek Society of Obstetrics and Gynecology. Prof Diedrich is currently medical director of the University Hospital of Lübeck. Prof Diedrich is a member of 18 national and international editorial boards and has published over the years 480 papers in national and international journals.