Catherine Kim, M.D.

Dr. Kim, a founding member of Simi Obstetrics and Gynecology Medical Group, has been in practice in Simi Valley since 1998 and has delivered over 2500 babies. She is passionate about women’s healthcare and views it as a privilege to care for her patients through the different phases of their lives.
A leader well respected in the community, Dr. Kim completed her tenure as the Chief of the Perinatal Department at Simi Valley Hospital from 2010 - 2012. Dr. Kim received the Adventist Health Simi Valley Hospital Physician of the Year Mission Award in 2013. Dr. Kim was Chief of Medical Staff at Adventist Simi Valley Hospital from 2017 through 2019. In addition, Dr. Kim has been the volunteer Medical Director at the Simi Valley Community Pregnancy Clinic since 2005. Dr. Kim is board certified by the American Board of Obstetrics and Gynecology and is a Fellow of the American College of Obstetrics and Gynecology and a member of the California Medical Association. She completed her residency in Obstetrics and Gynecology at the Harbor-UCLA Medical Center, where she received the “Excellence in Laparoscopic Procedure” honor as the chief resident. Dr. Kim earned her medical degree from UCLA School of Medicine after completing her undergraduate degree in Molecular Biology at University of California, Berkeley.
Dr. Kim enjoys music and spending time with her husband and three sons,

Irene Tan, M.D.

Dr. Irene Tan has been in private practice at Simi Obstetrics and Gynecology Medical Group since 2008. Dr. Tan completed her tenure as chief of Simi Valley Hospital’s perinatal department in December 2015. As part of her dedication to excellent patient care, Dr. Tan is committed to staying at the forefront of medical technology.
Dr. Tan has been published in various medical journals, including the American Society of Clinical Oncology, the Journal of Parasitology and the Journal of Herpetology. Dr. Tan is board certified by the American Board of Obstetrics and Gynecology and is a Fellow of the American College of Obstetrics and Gynecology and a member of the California Medical Association. She completed her residency in obstetrics and gynecology at the University of Buffalo. Dr. Tan earned her medical degree from Ross University School of Medicine after completing her undergraduate degree in biology at Whittier College.
During Dr. Tan’s off hours, she enjoys spending time with her family, traveling and cooking.

Grace Lee, M.D.

Dr. Grace Lee joined Simi Obstetrics & Gynecology Medical Group in 2011. She has a warm, comforting personality combined with clinical knowledge. She is committed to providing a caring atmosphere that addresses her patients’ needs and concerns.
Dr. Lee completed her tenure as Chief of the Perinatal Department at Adventist Health Simi Valley Hospital from 2017 to 2019. Dr. Lee received honors and awards in recognition of her academic and professional excellence during her residency, including CREOG Exam Achievement Award and Resident Research Awards. She has also presented her research in IUD at a national conference in 2011. Dr. Lee is board certified by the American Board of Obstetrics and Gynecology and is a Fellow of the American College of Obstetrics and Gynecology and a member of the California Medical Association. She completed her residency in obstetrics and gynecology at Drexel University College of Medicine in Philadelphia, Pennsylvania. Dr. Lee earned her medical degree from Albany Medical College in New York after completing her undergraduate degree in molecular cell biology at the University of California, Berkeley.
When Dr. Lee is away from the office, she enjoys spending time with her family and is kept very busy with her three young children.

Jennifer Lee, DO

Dr. Jennifer Lee joined Simi Obstetrics and Gynecology Medical Group in September 2019.  Dr. J. Lee is committed to providing compassionate, quality care to her patients of all ages.  She believes in and encourages shared decision making between the physician and patient and therefore takes the time to explain everything to her patients. 

Dr. J. Lee comes to us from a diverse background being born in South America and is fluent in Spanish.  She is a member of the American College of Osteopathic Obstetricians and Gynecologists and American Congress of Obstetricians and Gynecologists.  She completed her residency in Obstetrics and Gynecology at McLaren Greater Lansing Hospital in association with Michigan State University in Lansing, Michigan.  Dr. J. Lee earned her osteopathic medical degree from Touro University Nevada College of Osteopathic Medicine after completing her undergraduate degree in physiological sciences at University of California, Los Angeles. 

In her free time, Dr. J. Lee enjoys spending time with her husband and daughter and exploring new destinations and restaurants.

Brittney Ayers, FNP

Brittney Ayers joined Simi Obstetrics and Gynecology Medical Group in June 2020. Brittney Ayers is a certified Family Nurse Practitioner who is passionate about Women’s Health. She comes from a nursing background in Labor and Delivery, where she assisted and coached hundreds of women birth new lives into the world. Brittney Ayers earned her Nurse Practitioner degree from West Coast University after also completing her undergraduate degree from West Coast University with the highest level of honors in nursing. Brittney strives to reach her fullest educational potential and is currently pursuing her Doctorate of Nursing Practice. She is dedicated to caring for her patients with evidence-based practices and providing a safe environment for patients be treated. Educating her patients is one of her top priorities. Knowledge is power and by empowering her patients she strives to encourage them to become active participants in their care. Advocacy is also one of her strong suits and she makes herself available to make sure her patients receive the best care possible.

Brittney is a United States Army Veteran and is currently serving in the Reserves. When not in the office, Brittney enjoys spending time with her husband and daughter. She also loves to stay fit by attending barre classes, long distance running and cycling on her Peloton.

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