Aitken became a surgeon in the
Royal Infirmary of Edinburgh. In 1779 he is described as surgeon and lecturer on surgery in Edinburgh. He also wrote several books, chiefly as textbooks for his lectures. They were said to 'contain much valuable information, and show him to be fully conversant with the literature and philosophy as well as the practical department of his profession." John Aitken made certain practical improvements in surgery. He introduced an alteration in the mode of locking
midwifery forceps "to render the matter easier for the practitioner and... more safe for the mother and child." It is not clear where he graduated MD, which he included as a post-nominal from 1783. His name does not appear on the graduation lists of any of the Scottish universities or
Trinity College Dublin, but it is possible that he obtained this qualification in Europe. but all of his publications and other biographical sources use the spelling "Aitken". ==Works==