Dr. Robert welcomes you to Grossman & Grossman, M.D.s

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Phone (805) 498-0240

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Grossman & Grossman, M.D.s

558 N. Ventu Park Rd. Suite A, Thousand Oaks, CA 91320, US

Fax: (805) 498-0860


Monday - Thursday: 9AM–5PM

Friday: 9AM-12PM

Saturday - Sunday: CLOSED

Emergency Service: 24/7

Services Offered



Da Vinci Robotic Surgery



Gynecologic Surgery

About Us

Our Health Mission

Our mission is to provide top quality health care in a compassionate manner, always informing and working together with patients who partner with us in managing their own health care.

Experience and Professionalism

Grossman & Grossman MD's was established in 1988 by board certified, husband and wife OB-GYNs Drs. Hannah and Robert Grossman. Dr. Robert continues to provide the best care possible in the Conejo Valley. 

A pioneer in minimally invasive surgeries, Dr. Robert has conducted over a hundred robotic-assisted surgeries with the Da Vinci Surgical System. A California native, Dr. Robert grew up in Los Angeles and met the love of his life at USC Medical School. They've been together ever since, with over thirty years of marriage, four great kids, and two greater dogs to show for it. An undergraduate of UC Berkeley, Dr. Robert spent the first two years of residency focused on general surgery before switching to OB-GYN to learn alongside Dr. Hannah. They completed their OB-GYN training at the University of Tennessee. After a brief stay at Kaiser in Los Angeles, they moved to start a family and private practice in the Conejo Valley.

Dr Robert has been an active participant in hospital affairs. He was chief of staff at Westlake Hospital and Thousand Oaks Surgery Hospital. He has served multiple terms as chief of OB-GYN at Los Robles Hospital. His hobbies are playing piano, making wine, skiing, walking with his dogs, traveling, cooking, and movies, to name a few. Dr Robert does all aspects of general obstetrics and gynecology. He has a 30 plus year experience in doing obstetrics , gynecology, and surgery. He is one of the few certified daVinci robotic surgeons in the area and is capable of advanced laparoscopic surgery. 

In 2009, Dr. Hannah began engaging with the medical community as Los Robles Chief of Staff part-time while still providing the best private practice care. After 2 years of service, with the respect and trust earned of the medical community, Dr. Hannah felt the calling to play a bigger role in improving the region's healthcare. In 2011, Dr. Hannah split her time between the practice and Los Robles Hospital, serving as Chief Medical Officer part-time. By 2014, Dr. Hannah transitioned to CMO full-time, leaving the private practice in the steady hands of Dr. Robert. Dr. Hannah retains assisting privileges, regularly working together with Dr. Robert in surgeries, including cesarean.  

Experienced, thoughtful and compassionate care is what you can expect for any problem with Dr. Robert. He is the only one to see you for obstetrics in our office. He wants all obstetrical patients to also see a perinatologist while pregnant to get the highest quality ultrasounds and consults on your baby. 


Our staff  is our family. Most of them have been with us for more than a decade. We do our best to treat patients as we would like to be treated and go the extra effort to take care of any needs.