Professor Adam Balen is a British consultant in reproductive medicine, researcher, and author. He is known for his contributions to the study and treatment of polycystic ovary syndrome (PCOS) and infertility. Balen is the Lead Clinician at Leeds Fertility, part of the Leeds Teaching Hospitals NHS Trust. Early life and education. Balen qualified in medicine from St Bartholomew's Hospital Medical School, University of London, in 1983. He obtained a Doctor of Medicine (MD) in 1995 and a Doctor of Science (DSc) in 2010 from the University of Leeds. Career. In 1996, Balen was appointed as a consultant at Leeds Teaching Hospitals with subspecialty accreditation in reproductive medicine. He has contributed to the development of Leeds Fertility into one of the UK's largest assisted conception units. Contributions to Polycystic Ovary Syndrome (PCOS). Balen has conducted extensive research on the causes and management of PCOS. He co-authored the widely cited paper, *Ultrasound assessment of the polycystic ovary: international consensus definitions*, which helped establish diagnostic criteria for the condition. His research has influenced clinical practice guidelines for PCOS worldwide. Professional leadership and advocacy. Balen has held several leadership positions in reproductive medicine: Publications and media appearances. Balen has authored 16 books and over 280 peer-reviewed papers. Notable works include: Balen has appeared in various media discussing fertility and reproductive health, including the BBC documentary *Me, My Sex and I*. Personal life. Balen is married to Grace Dugdale, with whom he co-authored *The Fertility Book*.