At MAS you can choose from the flexibility of per diem shifts, the consistency and great pay of local contracts, the adventure of travel nursing, or specialized roles like Allied Health (PT, OT, COTA, SLP, PTA, etc.) all within one agency. Hi! We’re MAS Medical Staffing, one of the largest full-service healthcare staffing agencies in the country, and we have a better way to help our caregivers find the work they want.