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       Locations: Exton PA and Paoli PA   »  Click for Directions
Phone: (610) 280-3636
Great Valley OB/GYN Family

Great Valley Ob/Gyn | Practitioners

Carol L Coldren , M.D. Carol L. Coldren, M.D.

Dr. Coldren earned her medical degree from the University of Pennsylvania School of Medicine, going on to complete her residency in Ob/Gyn at Abington Hospital. Dr. Coldren has been in practice since then in Chester County, joining the staff of Paoli Hospital in 2003. She is board certified by the American Board of Obstetrics and Gynecology. She enjoys addressing the full range of women’s health care issues, from making routine and problem gyn visits as comfortable and non-threatening as possible to performing difficult surgery, and she still loves to deliver babies. She and her husband relish hiking, kayaking, and spending time with their extended families.
Sara Lyn Wheeler, M.D.
Sara Lyn Wheeler, M.D.

Dr. Wheeler earned her medical degree from the University of Pennsylvania School of Medicine and completed her residency at Northwestern University Medical School in Chicago, IL. She is board certified by the American Board of Obstetrics and Gynecology. Dr. Wheeler resides with her husband and three children in Chester County. Her outside interests include travel, gardening and cooking.

Deborah Bieter-Schultz, D.O. Deborah Bieter-Schultz, D.O.      Dr. Bieter-Schultz attended Philadelphia College of Osteopathic Medicine, graduating in 1984. She did her residency at Suburban General Hospital in Norristown. Board certified by the American College of Osteopathic Obstetricians and Gynecologists, she was raised in Havertown, PA and her family includes one adult daughter and 3 grandsons. She practices all fields of Ob/Gyn but her special interests are in high risk obstetrics and colposcopy. She also loves working with teenagers and first gyn visit patients. She is a member of the American Osteopathic Association, the American College of Obstetrics and Gynecology and the Catholic Medical Association and Physicians for Life. She enjoys being a merit badge counselor for several medically related badges with the Boy Scouts of America.

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Yardlie Toussaint-Foster, D.O.

Dr. Toussaint-Foster earned her degree at New York College of Osteopathic medicine and completed her residency at Philadelphia College of Osteopathic medicine. She is board certified by the American College of Osteopathic Obstetricians and Gynecologists. Her interests range from routine gyn visits and delivering babies to performing in office procedures and minimally invasive gyn surgery. She resides in Downingtown with her husband and son. She enjoys knitting, dancing and outdoor activities with her son.



Wendy Ronco, MSN, CRNP
Wendy earned her Master of Science from Seattle University in 2006 and is board certified in Family Practice. Since graduation, she has worked in the field of Ob/Gyn, first in the state of Washington, and more recently in Reading, Pennsylvania. She enjoys working with women across the lifespan and throughout pregnancy and strives to make all patients comfortable, especially adolescents and first time gyn patients.  Wendy resides with her husband and three children in Glenmoore. When not working she enjoys being active, exploring the outdoors, spending time with family and friends, traveling, and accompanying her children to their various activities.




Sara Collins, MSN, CRNP

Sara earned her undergraduate degree from Gwynedd Mercy College in 1994 and her master’s degree from Drexel University in 2015. She has 20 years experience working in OB/GYN in labor and delivery, post partum, and newborn nursery. Sara enjoys caring for women of all ages. She resides in Sanatoga with her husband and children. When not working Sara enjoys travel, cooking, and entertaining, as well as being an advocate for animals in need.


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