Professor David Crosby is CEO and Clinical Director of Merrion Fertility Clinic, Consultant Obstetrician and Gynaecologist and Head of the Department of Reproductive Medicine at the National Maternity Hospital, Dublin, and Associate Clinical Professor at University College Dublin. He heads the Ireland East Regional Fertility Hub as Clinical Lead, with a subspecialist practice in reproductive medicine, surgery and genetics.
He is Programme Director of the ESHRE-accredited subspecialist training programme in Reproductive Medicine at the National Maternity Hospital and Merrion Fertility Clinic.
Professor Crosby was appointed to the Board of the Assisted Human Reproduction Regulatory Authority in 2025. He contributes to national fertility policy including work on fertility, andrology and endometriosis services. He was a lead developer of the National Clinical Practice Guideline on Fertility Investigation and Management in Secondary Care and contributed as a stakeholder reviewer to the national IVF and ICSI guideline.
His research focuses on embryo implantation and the endometrial immune environment, ovarian reserve, male fertility, reproductive genetics and fertility preservation for children, adolescents and young adults affected by cancer. His publication record includes at least 50 peer-reviewed journal publications, alongside book chapters and published conference abstracts. His research has been supported by more than €1 million in grant funding. He supervises UCD doctoral researchers and clinical fellows and collaborates with researchers in Ireland and internationally.
He graduated in medicine from Trinity College Dublin and was awarded a Doctorate of Medicine by University College Dublin for his research on endometrial markers of implantation. He completed ESHRE/EBCOG-accredited fellowship training in Reproductive Medicine and Surgery in Dublin, followed by a clinical fellowship in Reproductive Genetics and Genomics at New York Presbyterian Hospital and Columbia University. He holds European Certification in Medical Genetics and Genomics and an MSc in Genomic Medicine with Distinction.
His research awards include the British Fertility Society Young Clinician Award and the RCOG Harold Malkin Prize. He also holds an MBA with Distinction from Edinburgh Business School, Heriot-Watt University, and completed a Quality Improvement Fellowship with the RCPI and the International Society for Quality in Health Care.