Ob-Gyn Specialists Who we are

Ob-Gyn Specialists is a team of doctors, nurses and staff all dedicated to comprehensive healthcare for women. We provide services for women through life’s transitions, from teens through the menopause and beyond. We are women caring for women, and we take our mission seriously.

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Ob-Gyn Specialists Our Physicians

Sari Kasper, DO

Sari Kasper, DO

Practicing with Ob-Gyn Specialists since 2006, Dr. Kasper enjoys the opportunity to work with women of all ages. She is board certified and her professional interests include adolescent gynecology, colposcopy and minimally invasive surgery including hysteroscopy, laparoscopy and da Vinci robotic surgery.

Janette Walker, MD

Janette Walker, MD

Dr. Janette Walker is a board-certified obstetrician-gynecologist practicing in Walnut Creek since 1997. Her special interests are infertility, obstetrics, gynecologic surgery and women's preventive healthcare. She enjoys the opportunity of working with women in varying age groups and at different stages of their lives.

Shannon Sullivan-Cramer, MD

Shannon Sullivan-Cramer, MD

Dr. Sullivan is passionate about women's health both inside and outside of work. Her particular interests include fibroids, endometriosis, family planning and preventative medicine. She is a minimally invasive gynecologic surgeon skilled with laparoscopy and the da Vinci robot.

Nicole Sadika Yee, MD

Nicole Sadika Yee, MD

Dr. Yee is dedicated to providing comprehensive and compassionate obstetric and gynecologic care to women of all ages and backgrounds. She believes in openly communicating with her patients and empowering them with the knowledge to make informed decisions affecting their health and well-being. She treats each person with the utmost thoughtfulness, respect, and empathy. Her special interests include minimally invasive gynecologic surgery, family planning, and contraceptive counseling as well as preventative healthcare.