Mark S Whiteley is an internationally recognised expert in venous surgery and venous conditions - venous leg ulcers, varicose veins, pelvic congestion syndrome, thread veins (spider veins) and aesthetic veins (face, forehead, arms, breasts and hands). He trained in St. Bartholomew's Hospital in London and has been a lecturer in surgery at Oxford University. Mark introduced endovenous surgery to the UK, performing the first case in the country on the 12th March 1999. He was the first in the world to perform 1,000 cases. He set up The Whiteley Clinic - now called "Whiteley Clinics" as a centre of excellence for venous surgery and research. He is also a visiting Professor at the University of Surrey, through which much of his research is performed. In 2001, Mark and Judy Holdstock invented the TRLOP technique for ablating perforator veins. Mark is invited to speak on venous surgery all around the world. He has published over 120 peer-reviewed research papers, written several chapters in specialist books and has won multiple international and national prizes for venous surgery and research. Mark founded The College of Phlebology (the study of veins) in 2011 as well as The Leg Ulcer Charity in the same year. Mark has a passion for teaching and is now writing books to help the public, medical and nursing students as well as doctors and nurses understand venous disease better. Using simple descriptions and many line diagrams, Mark makes quite complex medical conditions and treatments much easier to understand.