Meet our Team

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Bone Health Physicians

Nina Ma, MD, CCD

Dr. Ma is Director of the Bone Health Program and Co-chair of the Low Bone Density Working Group at Boston Children’s Hospital.  She sees bone patients in Endocrinology in Boston, Waltham and Peabody.




Ingrid Holm, MD, MPHIngrid A. Holm, MD, MPH, CCD

Dr. Holm is a pediatric geneticist and endocrinologist with a particular interest in genetic bone diseases including skeletal dysplasias and osteogenesis imperfecta as well as metabolic bone disease, including acquired and inherited forms of rickets.  She sees patients in Endocrinology and with the Orthopedic Surgeons in the Orthopedic clinic.


                                         Christina Jacobsen, MD, PhD

                                         Dr. Jacobsen is a pediatric endocrinologist and geneticist                                                with a particular interest in genetic bone diseases including                                            osteogenesis imperfecta and skeletal dysplasias as well as                                            metabolic bone disease.  She sees patients in Endocrinology                                          and with the Orthopedic Surgeons in the Orthopedic clinic.


Sarah Pitts, MD, CCD

Dr. Pitts specializes in the bone health of pre-teens, adolescents, and young adults.  As an Adolescent Medicine specialist, she cares for athletes on the female triad spectrum as well as adolescents with eating disorders or pubertal delay / arrest and menstrual dysfunction, taking into account the bone health implications of these processes.

                                          Melissa Putman, MD, CCD

                                          Dr. Putman is a dual-trained endocrinologist in adult and                                                 pediatric Endocrinology. Her interests include pediatric                                                   bone health, cystic fibrosis related bone disease, the                                                       prevention of adult endocrine complications of childhood                                                 diseases, and optimizing patient transitions from pediatric to                                           adult care.



Alexandra Haagensen, MDAlexandra Haagensen, MD

Dr. Haagensen is a pediatric endocrinologist who specializes in cystic fibrosis and lung transplantation associated bone disease.




DXA Technicians:

Alicia McAllister, RT(R), (BD), CBDT

Brooke Kachadoorian, RT(R)



Patricia Pratt, MA, RN, CPN, NE-BC, CPHQ

Jennifer A Fortin, MSN, RN, CPN, NEA-BC


Administrative Associates:

Kimberley Mitchell, BA, AAIII, (DXA)

Erika E. Griffin, AA (Endocrinology)

The future of pediatrics will be forged by thinking differently, breaking paradigms and joining together in a shared vision of tackling the toughest challenges before us.”
- Sandra L. Fenwick, President and CEO