Dr. R. S Chatterji, MD (Medicine), MD (Respiratory Med), DNB (Respiratory Med), is an interventional pulmonologist and internal medicine specialist with 45 years of experience. Specializing in pulmonary medicine procedures, sleep medicine, tuberculosis, and HIV/AIDS, his dedication lies in the treatment and well-being of his patients. With a vast background in managing complex cases across India in Army/ Command Hospitals and AFMC Pune for 27 years, he previously held positions as HOD at Base Hospital Delhi, HIV Center Delhi Cantt, Rockland Hospital, and served as a Senior Consultant in Respiratory and Internal Medicine at Fortis Escorts and Fortis Vasant Kunj for 11 years. Dr. Chatterji is a PG teacher at AFMC (Pune university), RR Hospital (Delhi university), ICMR, and for DNB; he has mentored numerous students for MD/DNB. He played a key role in establishing the DNB program at Fortis (Vasant Kunj) and serves as a DNB examiner. Currently, he serves as the Unit Head of Respiratory and Internal Medicine at Venkateshwar Hospital in Dwarka.