Cardiology (heart)
Spoken Languages


  • Royal College of Surgeons of Edinburgh


Mr Gaer graduated from the University of London in 1983 and completed his post‐graduate training at some of Europe’s leading centres of cardiac surgery: 

  • Royal Brompton and Harefield hospitals
  • Royal Postgraduate Medical School
  • Broussais Hospital in Paris.

He became a fellow of the Royal College of Surgeons in 1986 and was awarded his Master of Surgery from the University of London in 1996.

Mr Gaer was previously a consultant at St George’s Hospital in London and the Austin Hospital in Melbourne, Australia before moving to Harefield. 

He has worked extensively in the Middle East and China, as well as in South East Asia.

Areas of expertise

Mr Gaer is an internationally-renowned cardiac surgeon and one of Royal Brompton and Harefield's most experienced consultants.  

Mr Gaer is proficient in all aspects of adult cardiac surgery with a particular interest in:

  • aortic valve surgery, including minimal access aortic valve replacement
  • aortic root surgery
  • ascending aorta surgery
  • aortic arch surgery
  • surgery for endocarditis
  • complex re-do aortic surgery.

He is also accomplished in coronary artery bypass surgery, including total arterial revascularisation. 


Mr Gaer has been called a 'Surgeon of Hope' (Chirurgien de l’Espoir), regularly undertaking charitable missions to Vietnam, Cambodia, Afghanistan and other developing countries.

He is an honorary professor of surgery to the Chinese People’s Liberation Army and a member of the faculty of examiners of the Royal College of Surgeons of Edinburgh.

Research interests

Mr Gaer has published extensively on aortic surgery and is a much sought-after invited speaker at international meetings.

Private patient referral 

If you would like to make an appointment with this specialist for private care, contact the RB&HH Specialist care team