… ACHPN About Education Areas of Expertise Scholarly Work Sarah Rossmassler has been a nurse practitioner since 2001, graduating from the MGH Institute of Health … with a cohort of 12 physicians, nurse practitioners and social workers, and has been working at Baystate Medical Center in Springfield, MA on the inpatient … ACHPN About Education Areas of Expertise Scholarly Work Sarah Rossmassler has been a nurse practitioner since 2001, graduating from the MGH Institute of Health …