Jeffrey Traynor, M.D., M.B.A., F.A.C.O.G.

Dr Jeff TraynorA native of California, Dr. Traynor earned his undergraduate degree at the University of California, Santa Barbara where he graduated with high honors. He received his medical education from Northwestern University’s School of Medicine and simultaneously completed a Master’s degree in Business Administration at Northwestern University’s prestigious J.L. Kellogg Graduate School of Management. Dr. Traynor completed his specialty training in Obstetrics and Gynecology at Northwestern University’s Prentice Women’s Hospital and subsequently completed subspecialty training in Maternal-Fetal Medicine and Medical Genetics at Stanford University.
After completing his fellowship training at Stanford University, Dr. Traynor took flying lessons and ultimately married his flight instructor. They have two beautiful children, both born prematurely. Dr. Traynor enjoys swimming, golfing, hiking, fishing and flying (of course).
Dr. Traynor’s clinical interests include fetal embryology and development, genetics, prenatal diagnosis, hypertensive disorders of pregnancy, multiple gestations and how complex maternal medical complications impact pregnancy. Dr. Traynor is an experienced CVS and amniocentesis provider having performed thousands of procedures during his career.

Rosa H. Won, M.D., F.A.C.O.G.

Dr Rosa Won

Dr. Won is originally from New York City, where she grew up enjoying the shopping and museums of the Big Apple. She graduated from Williams College with a B.A. in Political Science. Dr. Won received her medical education from New York Medical College in Valhalla, NY, where under the mentorship of a perinatologist, she discovered her love for Maternal-Fetal medicine.
As Dr. Won’s husband is a California native, she left the cold winters of New York to enjoy the wonderful people and climate of the Bay Area. They have been blessed with 1 beautiful daughter who makes life so much more enjoyable and very busy. When she is not working, her life is full with being a soccer mom and juggling the various activities that involve her daughter.

Dr. Won’s clinical interests include: prenatal diagnosis, ultrasound and management of high risk pregnancies, especially placental and cervical disorders. Every pregnancy and family is so special and sometimes the journey is difficult. Whatever the circumstance, she strives to assist them in that journey. Dr. Won is always incredibly touched and appreciative when patients come back and show off their babies.

Brian Kellert, D.O., F.A.C.O.G

Dr. Kellert was born and raised in the bay area. He pursued undergraduate study of developmental biology and biochemistry at University of Washington. As a neonatology research assistant, he soon realized that prevention of neonatal disease was the ultimate treatment. Aiming to become a holistic perinatologist, he enrolled at Western University of Health Sciences, College of Osteopathic Medicine of the Pacific where he also performed neurodevelopment benchtop research and co-founded a health career pipeline for underserved youth. OBGYN residency and MFM fellowship at the Ohio State University brought priceless clinical and research experience, and prepared Dr. Kellert to join Drs. Traynor and Won in providing high quality perinatal medicine to the east bay area. Dr. Kellert’s wife is an educator, and with their two daughters they enjoy music, cooking, reading, and the outdoors.
Dr. Kellert’s clinical interests include prevention and treatment of preterm labor, hypertensive disorders in pregnancy, fetal origins of adult disease, multiple gestations, and prenatal diagnosis. Dr. Kellert is an approved CVS and amniocentesis provider in the California Prenatal Screening Program. Pregnancy may be the most vulnerable time of a woman’s life, and he believes it is our honor and privilege to escort patients through this special experience.


The physicians at Diablo Valley Perinatal treated my twin pregnancy with incredible warmth and dedication.  I know they provided my and my wife with the best care possible from our first visit to the delivery of our beautiful boys.  The doctors always made time to thoroughly answer all of my many questions and we never felt rushed.  While their personalities are different, each doctor had a peaceful way of making my pregnancy and delivery as calm and stress-free as possible.  My wife and I will be forever grateful for the wonderful care they provided that resulted in the arrival of our healthy twin boys.  Words cannot express how thankful we are. – T.M.


Dr. Traynor and his staff are way above the rest in this specialty.  I know – I have been elsewhere in the bay area.  The front office staff, ultrasound techs, genetic counselors and doctors – they all made us feel like we were the only ones that mattered.  Their “bedside manner” is what every doctor should strive for.  Everyone working there was knowledgeable, understanding, compassionate, professional and willing to help me whenever I had a question or problem.  This is an exceptional place – and you get that feeling from the second you walk in.  S.D.


In my first pregnancy, I experienced a second trimester loss attributed to cervical incompetence.  Thanks to Dr. Won, she recognized the problem, placed a cervical cerclage and monitored me closely throughout my pregnancy.   After the horror of my first pregnancy, I was really scared heading into my second.  Dr. Won was always there to put my mind (and emotions) at ease.  Her personality made me feel like one -in-a-million despite seeing her waiting room full every time I had an appointment.  The staff at Diablo Valley was professional and clearly competent.  I would highly recommend Diablo Valley Perinatal Associates to colleagues, friends and family members.  -M.T.


Our pregnancy was complicated by a chromosome problem and Dr. Kellert was amazing from our first appointment.  Across many ultrasounds and long conversations in person and on the phone, he listened to our goals, provided us with options, and helped us through our pregnancy.  What an amazing individual.  -B.L.




A Perinatologist's Perspective:

Antenatal testing is without a doubt - inconvenient.  Twice weekly visits to undergo antenatal testing between 32 weeks and the delivery of your baby is a real time committment and disruptive to work, family and social calendars.  As care providers, we empathize.  But the benefits of antenatal testing far outweigh the horror of a stillbirth that may have been preventable.