Professor Michael Zitzmann, born in 1964, teaches endocrinology (hormone disorders) and andrology (male health care) at the University Hospital of Muenster, Germany. He is involved in specialised patient care, ranging from boys with pubertal disorders to older men with a variety of sexual and metabolic problems. Couples with fertility problems form a major part of the patient clientele, as well as men with chronic inherited hormone disorders requiring life-time attention. Michael Zitzmann is largely involved in the research of the interplay of genetic issues, hormones, psychological characteristics and obesity. He is also cooperates with Prof. Bettina Pfleiderer in the BMBF funded research project “Gender-sensitive Concepts in Neuroscience“. He has received several international awards and grants in recognition of his work and is a member of international committees as well as journal editorial boards.