Professor Dr. C.V. Harinarayan is an excellent clinician, accomplished researcher, and scientist, astute bedside investigator, exemplary organizer, and administrator. He has an outstanding contribution in the field of Endocrinology. His research work has provided new perspectives on the correct diagnosis and treatment of metabolic bone diseases.He documented low vitamin D levels and low dietary calcium intake in urban and rural health subjects through population survey. By in-vitro studies of vitamin D synthesis, he showed that Indians could synthesize enough vitamin D by exposing 10 to 15% of body surface area to midday sun for 30 minutes. His work on dietary calcium and vitamin D status of Indian population could potentially change the Recommended Dietary Allowances (RDA) of India. He showed that low vitamin D status as the cause of bone disease in primary hyperparathyroidism. He was a co-chair in the development of “Clinical Practice Guidelines on Management of Postmenopausal Osteoporosis (2012-13) – Executive Summary and Recommendations” for Indian Menopause Society. He has studied vitamin D status in various endocrine and non-endocrine diseases like Type 2 Diabetes Mellitus - Epilepsy – Thyrotoxicosis – Crohn’s disease and Pulmonary Tuberculosis. His scientific work showed that correction of vitamin D deficiency could improve the pancreatic beta cell secretory function. His studies showed that renal tubular damage as the cause of bone disease in fluorosis (Ranked top 10 publications - the year 2007 by Internet).His work is internationally acclaimed and is quoted by many authors in their publications as well as in various textbooks. He has several publications in international and national journals. He has co-authored a book on diabetes and has written several chapters in many textbooks. As recognition of his contributions to the National academy of Medical Sciences (NAMS) conferred on him “Fellow Academy of Medical Sciences (FAMS)” and the Royal College of Physicians of Glasgow and Edinburgh conferred on him the FRCP (Glasgow & Edinburgh).He has won several awards like, “Hari Om Ashram Alembic Research Award 2003 – Operational Research” by the Medical Council of India. Received the award from the Hon’ble President of India; APSA- 2006 Award (Andhra Pradesh Scientist Award –2006) for excellence in medical research by the Andhra Pradesh Council of Science and Technology (APCOST) (State branch of DST, New Delhi); “Basanti Devi Amir Chand Prize for the year 2008” for the work and fluorosis by ICMR, New Delhi, 2011;Kala Rathna award 2007, by Bharathamuni Arts Academy, Madanapalle, AP, 2007, “SamikyaBharth Gaurav Satkar 2006” (formerly Ugadi Puraskar) for “Excellence in Medical Research”, at Vishakhapatnam, AP, 2006.He has delivered various orations – Dr. Dhakshinamurthy Gold Medal Oration, IMA, Tenali, AP; Dr. Subhashini and Dr. Kamalarkar Reddy Gold medal oration, SVIMS, Tirupati. AP; Prof. M.M.S Ahuja oration by Endocrine Society of India, 2009; Prof. Sarosi Mukherjee Memorial Oration by Endocrine Society of Bengal, Kolkata, 2009;Late Suma Jayaram Memorial Lecture – API – at Bangalore, 2008; Dr. V. Sundera Ramiah Memorial Gold Medal Endowment Lecture, Tenali, AP, 2003.Comprehensive care for Endocrinology, Diabetes, Diabetes in pregnancy, Diabetes and heart (Cardio Diabetology), Diabetes and kidney, Thyroid disorders in general and in pregnancy, Pituitary and Adrenal diseases, Osteoporosis and PCOD clinics are available in this department.