• 24.09.75-29.02.75
  House Physician; Dept. of Radiotherapy, Bombay Hospital MRC, Mumbai
• 01.04.75-31.01.75
  House Physician; Dept. of Surgery and Surgical Oncology, Nanavati Hospital & MRC, Mumbai
• 01.04.75-31.01.75
  C.M.O.; Casualty Dept., Nanavati Hospital & MRC, Mumbai
• 01.07.77-01.02.78
  House Physician; Dept. of Radiation Oncology, Tata Memorial Hospital, Mumbai
• 01.03.78-01.06.78
  Registrar; dept. of Radiation Oncology, Tata Memorial Hospital, Mumbai
• 02.06.78-30.07.80
  II nd and III rd year Residency; All India Institute of Medical Sciences, New Delhi
• 01.08.80-01.05.81
  Senior Registrar; Dept. of Radiation Oncology, Tata Memorial Hospital, Mumbai
• 01.08.81-20.08.81
  Asst. Prof. Of Radiotherapy; Dept. of Radiation Oncology, Kidwai Memorial Institute for Oncology, Banglore
• 28.08.81-onwards
  Chief; Division of Radiation Oncology, Nanavati Hospital & MRC, Mumbai

• Haldar Memorial Oration – Association of Radiation Oncologist of India, in the year 2010

National

• Association of Radiation Oncologists, India
• Indian Association of Medical Oncology, India
• Indian Society of Oncology, India.
• Indian Association of Immunologists, India.
• Indian Association of Cytologists, India.
• Indian Association of Hyperthermic Oncology & Medicine, India.
• Association of Medical Physicists of India.
• Indian Medical Association
• Indian Society for Radiation Biology
• Indian Society for Head & Neck Oncology
• Indian Society of Cancer
• Association of Health Administration
• Association of British Scholars
• Indian Brachytherapy Society
• Indian Nuclear Society
• Indian College of Radiation Oncology (ICRO)

International

• Association of Therapeutic Radiation Oncologists of America (ASTRO), USA
• Radiation Research Society, USA.
• North American Hyperthermia Group, USA. (Past)
• European Association of Hyperthermia (ESHO)
• New York Academy of Sciences.
• Asian Association of Radiation Research.
• International Clinical Hyperthermia Society.
• Asian Society of Hyperthermia and Oncology (ASHO)

Executive Posts on different groups

• Founder Member, Society for Cancer Research and Communication.
• Member, Licensing and Appellate Committee for Radiation Protection of Atomic Energy Regulatory Board, 1989-1993
• Treasurer, Society of Health Professionals (India) for Health and Human Rights (Past)
• President, Society for the Right to Die with Dignity
• President, Indian Association of Hyperthermic Oncology and Medicine
• Member – Adhoc committee to discuss the effects of Chernobyl – Russia. (past).
• President, Association of Radiation Oncologists of India – Maharashtra State Chapter from 1995-2001.
• Member of executive council of Indian Association of chemotherapists now named Medical Oncologists for two terms.
• Joint Secretary Indian Society of Oncology (ISO).
• Member of Indian Society of Health Administrators, (ISHA).
• Member of Indian Nuclear Society
• Member of Indian Brachytherapy Society, Chennai.
• Member of Advisory Committee of Indian College of Radiation Oncology, AROI
• President of ICHS International Clinical Hyperthermia Society, USA
• Vice President, Asian Society of Hyperthermia and Oncology 2009 onwards, Japan
• Vice President, Indian Association of Radiation Biology, 2011 onwards
• Life member of Indian Medical Association
• Member of Governing Council - Pushpagiri Institute of medical Sciences and Research Centre, Thiruvalla 689109, Kerala, India.
• Working Trustee – Indore Cancer Foundation, Indore, India.
• President of Society for Radiation Research (SRR)

Editor/on Editorial board

• Editor – On Line with Radiation Oncology, an AROI newsletter (2001-2002).
• Editor – Newsletter, Indian Association of Hyperthermia & Medicine
• Editor of National Breast Foundation Newsletter.
• Editors – National Member of Journal of Clinical Radiotherapy and Oncology (The official publication of the Association of Radiation Oncologists of India) (past).
• Editor-in-Chief, Journal of Cancer Research and Therapeutic – JCRT, peer reviewed indexed Journal by Medknow Publications
• Member, Editorial Board, International Journal of Hyperthermia
• Member, Editorial Board, Indian Journal of Cancer – Medknow Publications
• Member, Editorial Board, Indian Journal of Head and Neck Cancer
• Member, Editorial Board, International Journal of Hyperthermia informa publication U S A.– official Journal of ASHO, ESHO & NAHO.