Physician Assistant All potential applicants are encouraged to scroll through and read the complete job description before applying. - Primary Care Requisition Number: CHAP-2334 Cambridge Health Alliance (CHA) is a nationally recognized, award-winning, public health system located in Cambridge, Somerville and Boston's metro-north region. xywuqvp We provide innovative primary, specialty and emergency care to our diverse patient population through an established network of community based outpatient clinics and three hospital campuses.