Rhinebeck Office

5 Hook Road | Rhinebeck, NY 12572

Get Directions


Welcome to the Rhinebeck office of CMG.

Our doctors have been caring for children from Rhinebeck to Red Hook, from Pine Plains to Woodstock and many other communities in Northern Dutchess and Ulster Counties for 15 years. We provide a small office environment where you get to know your doctors, while having all of the resources that a large pediatric practice can offer. We focus on all aspects of health care for children, from infants through 21 years of age. We would love to be part of your family; come and be part of ours.

Your Rhinebeck Pediatricians:

Ask Dr. David Fenner what makes his world go around and the answer is simple: kids. When he’s not seeing pint-sized patients in his office, he’s spending his free time urging them to be creative and have fun outside, speaking to groups on nutrition and exercise, and providing treatment for children who otherwise can’t afford medical care.



Larkin Mitchell has led an interesting life. She is a former gymnast, and was an archeologist before going into medicine. She has traveled extensively, including relief work in Haiti as a member of an all-nursing team, which has given her a worldview and wide perspective about medical care. Larkin spent her early nursing career caring for critically ill children and newborns in intensive care. Larkin says, “My focus now in pediatrics is primarily with asthma, allergy and pulmonary conditions.”

Dr. Carolyn Hirschmann grew up on the North Shore of Long Island, and her education spans some of New York State’s finest institutions, from Cornell University to Cohen Children’s Medical Center. At CMG her primary focus is on nutrition and wellness, preventative health, and developmental pediatrics. She believes that establishing good health and nutrition habits from infancy set the groundwork for a healthy and active child.


Megan Hays

Megan Hays, CPNP studied nursing at Columbia University School of Nursing, where she went on to earn her degree as a nurse practitioner. She is certified by the Pediatric Nursing Board. Joining our team in October of 2020, Ms. Hays brings with her an interest and genuine concern for families and children in times of stress and transition. Her medical interests include caring for new moms and lactation medicine, new immigrant health care, asthma education and preventative care, and constipation.

Dr. Marcella Spera has been an essential addition to Children’s Medical Group. Dr. Spera completed her undergraduate degree at Sarah Lawrence College, before attending medical school at Penn State. She then completed her residency at the University of New Mexico, and is board certified in Pediatrics. As a member of the American Academy of Pediatrics, her dedication to medicine is evident.

Dr. Spera


  • Monday & Tuesday:
  • 9:00 a.m. - 7:00 p.m.
  • Wednesday - Friday:
  • 9:00 a.m. - 5:00 p.m.
  • Closed for Lunch:
  • 12:30 p.m. - 1:30 p.m.
  • Phone: (845) 452-1700
  • Fax: (845) 452-1752