He completed house posts and early training with both
George Ernest Beaumont at the
Brompton Chest Hospital and the Middlesex Hospital and with
Professor John Scadding at the Brompton Hospital and the
Hammersmith Hospital, where he first became interested in
Sheila Sherlock, who he later married, and
sarcoidosis, a condition that was a specialism of Scadding. The meeting lasted for three days and was the first international conference on sarcoidosis. He was later involved in setting up the
World Association of Sarcoidosis and other Granulomatous Disorders (WASOG) in 1987, in
Milan, Italy and became its first president. Subsequently, with the personal financial support of
Gianfranco Rizzato, the journal
Sarcoidosis, later renamed
Sarcoidosis Vasculitis and Diffuse Lung Diseases, became the association's official publication. James became the journal's editor-in-chief and in 1987, the journal published a
festschrift in his honour. In 1959, James was appointed consultant physician at London's
Royal Northern Hospital and shortly after, began a specialist sarcoidosis clinic, which attracted
rheumatologists from around the world. The clinics provided an abundance of people with the disease with referrals from around the country and carried out a number of clinical trials. His registrar at the time,
Alimuddin Zumla, later described James as "an excellent teacher...if you listened to his lectures you would never forget them. He had a way of imparting knowledge that was special". James also encouraged a multidisciplinary approach in order to better understand the disease and according to Zumla, was intrigued by the mystery that surrounded sarcoidosis, a rare long-term disease with an unknown cause. "Gerry liked challenges", said Zumla. In 1959, with Gordon Beckett and Simon Behrman, he co-founded the
Eye Physic Club. From 1963 he was involved in a new medical eye unit which later moved to
St Thomas' Hospital. In 1968, he was appointed as
dean to the Royal Northern Hospital. His private practice was at 149 Harley Street. James's lifetime work on sarcoidosis led him to be known as the "King of Sarcoid". ==History of medicine==