Marcus was appointed Consultant Orthopaedic Surgeon at Guy's and St Thomas' Foundation NHS Trust in 2002.

His practice is exclusively confined to problems in and around the hip joint. During his training he recognised the rapid growth in knowledge and advances in surgical treatment of young adult hip disorders. His time in Boston with Dr Michael Millis was particularly important as he learned the technique and saw the excellent results of peri-acetabular osteotomy for dysplasia (PAO). He was also introduced to the concepts and surgical treatment of femoro-acetabular impingement (FAI).

On taking up his Consultant post, Marcus has developed a specialist practice treating this small but important group of patients and acknowledges the continued support of colleagues who refer patients to him. Marcus also identified the increasingly important role of hip arthroscopy to diagnose and treat many hip conditions at a time when the procedure was moving out of the realms of experimental surgery and into an established technique.

Marcus is the orthopaedic surgeon in the multidisciplinary service for sickle cell anaemia at Guy’s Hospital. This team allows these patients to have safe and effective hip replacement surgery, a procedure that, in the past, was much less predictable. He has pioneered the use of uncemented ceramic on ceramic hip replacements in this patient group.

Recognised as an opinion leader in hip surgery, Marcus gives between 20 and 30 talks a year to local and national meetings on the subjects of ceramic on ceramic total hip replacement, hip resurfacing, hip arthroscopy, hip dysplasia, hip impingement and the orthopaedic complications of sickle cell disease. He is a regular contributor at the British Hip Society, London Hip Meeting, The Great Debate, and The St George’s Revision Forum as well as being a reviewer for a number of orthopaedic journals.