Dr. Richard Berkson's Endocrinology Team

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Saturdays as Scheduled Between
9:00 AM - 1:00 PM

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Dr. Richard Berkson and Our Staff

Thank you for taking the time to learn more about the Endocrinology Team. Our physicians and other team members share the team mission of offering unparalleled medical treatment and follow-up services. We are truly committed to providing superb endocrinology care to patients in our area. Read more about Dr. Berkson and the rest of our dedicated staff today.

Welcome to Dr. Richard Berkson's Endocrinology Team!  Rated One of America's Top Doctors By Castle Connolly

Richard Berkson, MD, FACE, Board Certified in Internal Medicine and Endocrinology


Our founder, Dr. Richard Berkson, is a proud graduate of Brown University and the University at Buffalo's School of Medicine, which his father also attended. He served as chief fellow in diabetes at the Joslin Clinic in Boston, MA, the largest outpatient center for diabetes in the United States, which is affiliated with Harvard Medical School. He then had a second fellowship studying thyroid diseases at UCLA under experts Andre VanHerle, Inder Chopra, and David Salomon. His mentor at UCLA was Dr. Mayer Davidson, a well-known expert in diabetes.

Dr. Berkson was a founding member of the Long Beach Chapter of the American Diabetes Association, and he served as its president for five years. He spearheaded the hugely successful Long Beach Walk for Diabetes, and he has been a speaker and participant for 13 years. He is pleased to note that ProHealth took this on as its primary fundraising activity. The walk has grown to over 1,000 participants, and it has raised over $150,000 in a single year.

Dr. Richard Berkson SpeakingMedical Diagram

For four years now, Dr. Berkson has been a featured speaker at the annual Diabetes Expo at the Long Beach Convention Center. More than 7,300 people recently attended this free educational event. He has been an associate clinical professor at UCLA School of Medicine and Teaching Head in Endocrinology at St. Mary Medical Center for over 20 years. He is also the winner of the 2000 Mary O' F. Horn, M.D. Award for Excellence in the Teaching of Ambulatory Medicine.

LA Magazine featured Dr. Berkson in its list of the best physicians in Los Angeles. Men's Health included him in their list of the best experts in men's health, and the Castle Conolly guide to America's top doctors included Dr. Berkson for eight consecutive years, beginning in 2009.

Dr. Berkson has four daughters with his beautiful wife of 36 years, Andrea. He joined ProHealth Partners in 1996, and he has not missed a day of work in 30 years, aside from scheduled vacations. He enjoys watching and playing basketball and rooting for his favorite NFL team, the Buffalo Bills.

Dr. Berkson's motto is, "treat your patients like family" and is something our practice lives up to every day. Our practice is glad to leverage his extensive experience and dedication to provide our patients with superb care.


Kanchana Viswanathan, MD, FACE


Board Certified in Internal Medicine, Endocrinology, and Metabolism

Languages Spoken

  • English
  • Tamil

Education and Training

  • Medical Education:
    M.B.B.S.
    Stanley Medical College
    University of Madras
    Chennai, India
    1977 - 1983
  • Internship and Residency:
    Mt. Sinai Hospital
    Chicago Medical School
    Chicago, IL
    1988 - 1991
  • Fellowship:
    Endocrinology and Metabolism
    Michael Reese Hospital
    University of Illinois
    Chicago, IL
    1991 - 1993

Hobbies and Interests

  • Dr. Viswanathan is married and has one adult son. She enjoys traveling, listening to music, reading, yoga, and walking.

Hospital Affiliations

  • Long Beach Memorial Medical Center
  • St. Mary Medical Center

Yasaman Mohtasebi, MD


Board Certified in Internal Medicine, with a Specialty in Endocrinology/Metabolism

Languages Spoken

  • English
  • Spanish
  • Persian

Education and Training

  • Residency, Internal Medicine
    UPMC-Mercy Hospital
    Pittsburgh, PA
    June 2006 - June 2009

Endocrinology Fellowship

  • University of Maryland Medical Center
  • Baltimore, MD
  • July 2013 - June 2015

Hobbies and Interests

  • Dr. Mohtasebi enjoys skiing with her husband during the winter and loves reading and listening to music in her spare time.

Hospital Affiliations

  • Community Hospital of Long Beach
  • Long Beach Memorial Medical Center
  • St. Mary Medical Center

Other Team Members

  • Nayna Paryani, FNP — Endocrinology Evaluations Assisting Dr. Berkson
  • Matthew Clarke, MD
  • Ricky Phong Mac, MD, FACE — Hospital Care
  • Sophia HSU-ZIC, MPH, RD — Clinical Nutrition