Mark Whiteley is a consultant venous surgeon and founder of The Whiteley Clinic, now in London, Guildford and Bristol. He is also a visiting Professor at the University of Surrey and an internationally recognised expert in venous disease and endovenous surgery. Mark qualified in 1986 from St. Bartholomew's Hospital, completed the Bristol and Portsmouth surgical rotations before becoming a lecturer in surgery at the University of Bath followed by Oxford University. He was appointed as a consultant vascular surgeon at The Royal Surrey County Hospital before leaving and becoming 100% venous surgeon in 2005. With his colleague Judy Holdstock, he introduced endovenous surgery into the UK by performing the first endovenous operation in the country on 12th March 1999. Mark founded The Whiteley Clinic in 2001 and invented the TRLOP operation with Judy Holdstock the same year. He founded The College of Phlebology in 2011 and runs an annual international veins meeting in London, and founded the Leg Ulcer Charity - to empower patients to find a cure and to teach health care professionals that most leg ulcers can be cured without long tern dressings and bandages. Mark has written this book and edited another book on veins; has written 15 chapters on veins in textbooks; has over 110 peer-reviewed research papers and has won multiple international and national prizes for his work in veins. He is regularly invited to meetings around the world to give guest lectures on venous diagnosis and treatments, or to chair or moderate sessions and sits on the international committee of the American Venous Forum. In 2017 he was given an award by Publons for being in top 1% of medical reviewers as a peer-reviewer for venous papers. Committed to education, Mark runs the EVLT (endovenous laser treatment) International Academy for Angiodynamics 4 times per year since 2012 and runs courses, work experience, summer research fellows, extended research fellowships and PhD students. He won a KTP grant from the UK government to set up a research department - performing confidential research for companies to advise them on how to optimise their vein treatments and to do his own research to ensure the efficacy of treatments used at The Whiteley Clinic as part of The Whiteley Protocol. Mark is regularly featured in the national media in the UK: he has been recommended by Tatler for the last 10 years. He has had multiple appearances on TV including - "Embarrassing Bodies", "Harley Street", "Don't ask the Doctor" as well as being featured in featured in national newspapers and magazines regularly.