He was appointed as a Consultant in Plastic and Reconstructive Surgery to St Bartholomew’s Hospital and the Royal London Hospital in 1989. He was subsequently appointed as Lead Clinician and Director of the Craniofacial Unit at the Chelsea and Westminster Hospital, treating all forms of facial conditions. His interest in facial surgery constituted the majority of his NHS practice. In 2005 he resigned from the NHS and is now in full time private practice, where he undertakes all forms of cosmetic surgery in addition to reconstructive and facial surgery. He has published over sixty papers in the medical literature, and has an active research and teaching profile. He has supervised undergraduate degree courses in conjunction with Imperial College of Science Technology and Medicine. He is frequently an invited speaker and member of expert panels on international courses and conferences on facial aesthetic surgery. He has served as a member of the Editorial Advisory Board of the British Journal of Plastic Surgery.
In 2003 he co-founded the charity 'Facing the World' treating children from developing countries with a wide variety of congenital facial conditions. He has travelled to Sri Lanka, Ghana, Saudi Arabia, Qatar and Ethiopia treating children with cleft lip and palate and other major facial conditions.
Mr Waterhouse is a volunteer with Operation Smile travelling to developing countries worldwide offering cleft lip and palate surgery to children who would not otherwise be able to access surgery.
He is a full member of the British Association of Aesthetic Plastic Surgeons, and the International Society of Aesthetic Plastic Surgeons.
He is a former President of the British Association of Aesthetic Plastic Surgeons and a former President of the Section of Plastic Surgery of he Royal Society of Medicine. He is included in the Specialist Register established by the General Medical Council in 1995.