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Our OBGYN Physicians


Primary OB/GYN Physicians | Specialists


 Primary OB/GYN Physicians

Leena Nathan, MD - UCLA Health OBGYN Westlake Village. Leena Nathan, MD
Obstetrics & Gynecology

Dr. Leena Nathan received her undergraduate education at University of California, San Diego and medical degree from Stanford University. She is board certified in family medicine and first completed a family medicine residency at Kaiser Woodland Hills before completing a four-year residency in obstetrics and gynecology at UCLA.

Dr. Nathan specializes in comprehensive care for women including well-woman visits, obstetrics, and gynecology/gynecologic surgeries. Her focus lies in promoting the well being of women of all ages ranging from adolescence through menopause. She also believes strongly in patient empowerment through communication. Dr. Nathan's favorite part of being a doctor is helping women have healthy pregnancies and deliveries.

She enjoys spending time with her husband, who is also a local physician, and her two young children as well as her yellow labrador.


Ranoo Sabnis, MD - UCLA Health OBGYN Westlake Village. Ranoo Sabnis, MD
Obstetrics & Gynecology

Dr. Ranoo Sabnis grew up in a small town in central Pennsylvania and graduated with honors with a degree in Molecular Biology from Lehigh University in Bethlehem, Pennsylvania. She received her medical degree at University of Pittsburgh and trained in obstetrics and gynecology at Rush University in Chicago. Dr. Sabnis served as chief resident and continued on as a faculty member after graduation. She is board certified by the American Board of Obstetrics and Gynecology.

Dr. Sabnis and her husband, a neonatologist, moved to Southern California in 2012 and joined UCLA. She enjoys providing comprehensive obstetrics and gynecology care for women of all ages. In treating each woman as an individual, she strives to provide tailored and evidence based care to all of her patients to promote their optimal health and well being.

She enjoys baking, knitting, reading and spending time with her husband, son, and new baby girl.


Angela Valle, MD - UCLA Health OBGYN Westlake Village. Angela Valle, MD
Obstetrics & Gynecology

Dr. Angela Valle grew up in the San Joaquin Valley and received her undergraduate degree from Stanford University. She obtained her medical degree from Albany Medical College where she discovered her passion for women’s healthcare. She completed her residency in obstetrics and gynecology at Los Angeles County - USC Medical Center, where she served as chief resident before joining UCLA. She provides comprehensive healthcare to women and especially enjoys guiding, supporting and educating them through pregnancy and childbirth.

Dr. Valle is passionate about providing comprehensive healthcare to all women, and especially enjoys guilding, supporting and educating them through pregnancy and childbirth. She believes it is a privilege to see women through some of the most exciting and, sometimes stressful, times in their lives.

When not busy at work, she enjoys reading, running, and trying new recipes and restaurants.


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 Joshua G. Cohen, MD - UCLA Health OBGYN, Gynecologic Oncology

 Joshua Cohen, MD
Gynecologic Oncology

Dr. Cohen attended both undergraduate and medical school at Northwestern University in the Honors Program in Medical Education. He went on to residency in obstetrics and gynecology at the University of California San Francisco and completed a gynecologic oncology fellowship at the University of California Los Angeles.

Dr. Cohen has distinguished himself on many levels in gynecologic cancer research. He has completed the Clinical Research Training Program at the National Institutes of Health as well as the Clinical and Translational Science Institute certificate program at UCLA Medical Center. His research interests include the treatment of recurrent ovarian cancer and patient centered outcomes in gynecologic oncology. He is trained in the latest surgical techniques including minimally invasive procedures with robotics.

Dr. Cohen also practices at UCLA's Westwood location - 200 Medical Plaza, 4th floor, Los Angeles, CA 90095 

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Tamara Grisales, MD

Dr. Tamara Grisales earned her medical degree from the University of Texas Medical School at Houston. She held her internship and residency in obstetrics and gynecology at UCLA. Dr. Grisales completed her fellowship in Female Pelvic Medicine and Reconstructive Surgery at UCLA.

Dr. Grisales also practices at UCLA's Westwood location - 100 Medical Plaza, Suite 383, Los Angeles, CA 90095

 Daniel A. Kahn, MD, PhD - UCLA Health OBGYN, Maternal & Fetal Medicine

 Daniel A. Kahn, MD, PhD
Maternal & Fetal Medicine

Dr. Kahn is an assistant professor in Maternal-Fetal Medicine at the David Geffen School of Medicine at UCLA. He received his medical degree from the UC San Diego School of Medicine and completed his obstetrics and gynecology internship and residency at UCLA. His research interests are in preeclampsia, immune tolerance and autoimmunity.

 Ramamohan Rao, MD - UCLA Health OBGYN Westlake Village.

 Ramamohan Rao, MD
Obstetrics & Gynecology

Dr. Ramamohan Rao earned his medical degree at Mysore Medical College in India. After moving to the United States, he held an internship at New York University Downtown Hospital and completed his residency in Obstetrics & Gynecology at New York University-Bellevue Medical Center.

Dr. Rao has more than 30 years of experience as a board certified OB/GYN, with vast experience in gynecological surgeries and obstetrics. He assists our team in surgeries and deliveries.



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