Miss Jeannie Yoon is a Consultant Obstetrician and Gynaecologist, treating patients at The Lister and The Portland Hospitals. She became fully private in 2006, having previously served as a Consultant at Homerton University Hospital. Miss Yoon trained at St Thomas' Hospital and has worked at several leading teaching hospitals, including Queen Charlotte's, Chelsea & Westminster, and the John Radcliffe in Oxford, all of which are tertiary referral centres for high-risk pregnancy and specialist gynaecology treatment.

Her areas of specialist interest include polycystic ovarian disease, menstrual disorders, PMT, hormone replacement therapy, menopausal disorders, and contraception. Miss Yoon has specialist knowledge of abnormal smears and colposcopy, having spent three years at the Royal Marsden Hospital as a Cancer Research Campaign Fellow.

Miss Yoon is highly skilled in procedures such as colposcopy, coil insertion, and smear tests. She treats a range of conditions including irregular periods, late or missed periods, pre-menstrual syndrome, polycystic ovary syndrome, menopause, and provides contraception advice. She has been practising since 1986 and continues to contribute significantly to her field.