Kathryn Burge, MD                            Alameda Office                                    
Dr. Kathryn Burge is a board-certified pediatrician who has been in practice since 2015 after completing her medical degree at the University of Colorado and her residency at UCSF Benioff Children’s hospital of Oakland. She also holds a Bachelor of Arts degree from Boston College.
She joined PPMG in the summer of 2017 and splits her time between our Castro Valley and Oakland offices. She has a rich history of multiple and varied research and volunteer experiences in African orphanages and local community centers. Dr. Burge, who is also fluent in French, enjoys spending time with her husband and two young children.

We regretfully announce that Dr. Fiona Marion left the Practice after her maternity leave to spend more time with her three young children and avoid the long commute from Marin. We miss her and wish her the best.

Susan Alford, PNP                                  Alameda Office
Susan Nicole Alford completed her undergraduate degree in nursing from the University of Alabama. She worked for 10 years at Children's Hospital of Alabama and Texas Children's Hospital in Houston as a pediatric nurse. Susan then completed a Master of Science in Nursing at the University of Texas Health Science Center in 2012.  As a Certified Pediatric Nurse Practitioner in Primary Care, she worked at the Alaska Center for Pediatrics in Anchorage, AK. We were very please to have her move to Alameda with her husband and daughter and join the staff at PPMG. Her loves are family time, their 3 dogs, traveling, reading, cooking, bike riding and puzzles. She finds working with children fun because of their honesty and ability to make her laugh every day.

Bruce Horwitz, MD                                          Oakland Office
Dr. Bruce Horwitz received his undergraduate degree from U.C. Berkeley, and completed medical school at Washington University in St. Louis. He is board certified by the American Board of Pediatrics and has been practicing in his hometown of Oakland for more than 40 years. Dr. Horwitz is one of Primary Pediatric Medical Group's founding physicians, helping to form the group in 1996 after many years in solo practice. He was formerly the doctor for the Childrens Home Society, the Oakland Athletics Major League Baseball, Oakland Marathon and the Alcatraz Triathalon. Not surprisingly, he enjoys sports medicine and is rewarded with success treating warts and ADHD. When not seeing patients, Dr. Horwitz enjoys his grandkids, biking and running marathons. In fact, he has run a marathon on all 7 continents!

Patricia Chiang, MD                   Oakland Office                    
Dr. Patricia Chiang received her undergraduate degree from UC Berkeley and her medical degree from Temple University, graduating with honors. She has been supervising and teaching resident physicians at Children's Hospital, Oakland, and has consulted with Thunder Road, an adolescent drug rehabilitation clinic in Oakland. Dr. Chiang has been with Primary Pediatric Medical Group since 1996. She is certified by the American Board of Pediatrics and speaks some Mandarin. When she is not seeing patients, she enjoys reading, traveling, and spending time with her husband and their three active children, including a set of twins!


Erica Glenn, MD                                       Castro Valley Office

As a Board Certified pediatrician, Dr. Glenn joined PPMG in July 2016 at our Castro Valley office. She attended St. Louis University School of Medicine after earning an undergraduate degree at the University of North Carolina at Chapel Hill, NC with a BA degree in Exercise and Sport Science with honors. Her residency training was at UCSF Benioff Children's Hospital in Oakland where she attained the distinction of Chief Resident. She has volunteered as a mentor for the Community Health and Adolescent Mentoring Program for Success (CHAMPS) and was a licensed and certified athletic trainer who works out chasing after her young son. We were very pleased to have Dr. Glenn join our team but now we all have to stay in shape!



Michael Usem, MD                             Oakland Office
Dr. Michael Usem came to Stanford University from Minnesota for his undergraduate work and then traveled back to the University of Minnesota for medical school to complete his M.D. He finished his residency at Children's Hospital, Oakland, and has been supervising and teaching resident physicians and students at both Children's Hospital, Oakland and UC San Francisco medical school. He is certified by the American Board of Pediatrics and is a founding partner of Primary Pediatric Medical Group. Dr.Usem is currently President of the Medical Staff at Alta Bates Summit Medical Center.  In his spare time he enjoys music, walking, tennis, hiking, skiing, and traveling with his wife and two boys.

Georganne Walker, PNP                                                 Alameda Office
Georganne Walker, P.N.P., IBCLC, completed her B.S. in Nursing at University of San Francisco  and received her Masters in Nursing from UCSF. She became a certified pediatric nurse practitioner in 1994 and an internationally board certified lactation consultant in 2002. Georganne worked as a staff nurse at Children's Hospital Oakland from 1985 until 2002 where she worked in the neonatal intensive care unit, the emergency department, and the Pediatric Urgent Referral Line. From 1994-2004 she was with Rainbow Pediatrics as a Nurse Practitioner and Lactation Consultant. When not busy at Primary Pediatric Medical Group (PPMG), Georganne  facilitates a breastfeeding support group at Alta Bates Hospital where she also works as a lactation consultant. Georganne joined PPMG in December 2004. She is married and enjoys spending time with her husband and two sons. She also enjoys hiking, cycling, gardening, cooking, and sewing.

Kenneth Ducker, MD                                      Castro Valley Office
Dr. Kenneth Ducker received his undergraduate degree from Oberlin College in Ohio and attended medical school at New York University. After completing his medical degree, he completed his residency at Children's Hospital, Oakland. He is certified by the American Board of Pediatrics and he has been supervising and teaching resident physicians in both inpatient and outpatient settings at Children's Hospital since 1978. In 1995, he was awarded the Children's Hospital Community Physician of the Year for his commitment to primary care and community service. For seven years, he was Chief of the Division of General Pediatrics at Children's. Dr. Ducker joined PPMG in 1998, after having practiced in the Castro Valley community for many years. In his free time, he enjoys running, music, hiking, movies and spending time with his wife, grown children, and grandchildren.