Dr. Mathew John, trained in Endocrinology from King Edward Memorial Hospital, Mumbai is experienced in the treatment of all forms of endocrine disorders and diabetes. He was a faculty at the Department of Endocrinology, Christian Medical College, Vellore before moving to Trivandrum. During his training, he has received extensive experience in management of pediatric endocrine disorders, thyroid diseases, adrenal and pituitary diseases. He is keenly interested in growth hormone therapy and other forms of hormone replacement therapy.  He is trained in advanced diabetes therapeutics and technology at International Diabetes Centre, Minneapolis and uses technologies like CGMS and insulin pumps. He is certified in bone densitometry by International Osteoporosis Foundation and has attended training in thyroid ultrasound organized by Endocrine Society (Boston). He is involved in researching new molecules in osteoporosis, diabetes and growth hormone insufficiency. He is a key opinion leader in scientific forums both in India and abroad. He is a member of Endocrine Society, Endocrine Society of India (ESI) Asia Pacific Pediatric Endocrine Society (APPES), Research Society for the study of diabetes in India (RSSDI), Indian Medical Association (IMA) and Indian Society for Bone and Mineral Research (ISBMR). He is on the editorial board of Indian Journal of Endocrinology and Metabolism.

He is key opinion leader in diabetes and endocrinology and regularly lectures at state and national conferences. He has presented at EASD 2015 at Stockholm and RSSDI 2015 at Lucknow.