He received his medical degree from UMass Medical School and completed his residency and chief residency at Boston Medical Center in 2001. After working as a primary care clinician at Massachusetts General Hospital for nearly six years, Dr. Crocker moved to rural Malawi as Director of Clinical Services with Abwenzi Pa Za Umoyo (Partners In Health), Malawi. In this role, he supported and augmented clinical services focused on HIV, TB and malaria at the district level, oversaw the creation of Chronic Care and Kaposi Sarcoma clinics, and supported the growth of medical inpatient services at Neno district hospital after it was built.