John Arthur Thomas born of medical-doctor-parents in 1937, completed his schooling from a well-known British-Indian School, the Bishop Cotton's Boys' High School at Bangalore, India in 1953. He studied at the Christian Medical College at Vellore and specialized in his “primary” interest, Human Pathology. He developed an early “second” interest - British Indian history at this stage and visited the Fort Museum at Fort St. George at Madras in 1953. There he viewed what was called Register No: 1 at the Fort Museum which contained the entry of the Clive marriage. Little was known of Margaret Maskelyne and that intrigued him. The ensuing 50 years saw him concentrating on his “primary interest” the speciality of Pathology. He returned to Bangalore to St. John’s Medical College, where he was tasked to provide laboratory services, lectures, teach, organize, research, and held several administrative positions.
He left the service at St. John's in 1993 after 28 years as Professor and Head of Pathology and Head of Laboratory Services and was thereafter appointed Emeritus Professor. He has over 110 medical publications and nine medical book chapters to his credit. He once again took up his “second” interest in British Indian History and started work on Margaret Maskelyne. He is married to Irene Manorama Thomas, who was also Professor and Head of Anatomy at St. John’s. He has one son, David, who is a Senior Manager in Human Resources Management for a multinational Company.