Ob-Gyn Specialists Our Providers

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 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 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.

Advanced Practice Providers

Kristina Gilmore, PA-C

Kristina Gilmore, PA-C

Kristina Gilmore, PA-C, was raised in the Bay Area and attended Carondelet High School. She graduated from CSU Chico with honors in Exercise Science. She then completed her Master of Science in Physician Assistant Studies at Pacific University in Hillsboro, OR, in August 2021. She is a Certified Physician Assistant with the NCCPA. Prior to PA school, she worked at OB-GYN Specialists as a medical assistant. She enjoys working with women of all ages, and is particularly passionate about sexual health, contraception care, and preventative care.

Kathy Koger, NP

Kathy Koger, NP

Kathy has been working as a Nurse Practitioner in Women's Health since 1997. Prior to that, she was a doula and childbirth educator. She enjoys engaging with women of all ages to help them find integrative solutions to their health challenges, incorporating nutrition, homeopathy, and behavioral health.

Caitlin Miller, CNM

Caitlin Miller, CNM

Caitlin Miller received her Certified Nurse Midwife and Women’s Health Nurse Practitioner degrees from UCSF in 2011. Prior to joining Ob-Gyn Specialists, Caitlin practiced for 10 years in Davis and the Bay Area, most recently delivering babies for five years at Alta Bates Hospital in Berkeley. She practices the midwifery model of care, providing evidence-based information to help her patients make the right decisions for themselves and their families. She is a deeply compassionate and dedicated provider who goes the extra mile to support and advocate for her patients. She is passionate about group prenatal care, holistic healthcare, contraception, and LGBTQ health. She received additional training in gestational diabetes and has collaborated with dieticians and obstetricians to optimize care for these patients. Caitlin has a partner and a hilarious one year old, and you can find them watching the lemurs at the zoo or dawdling around the redwoods.