New Horizons is the largest mental health and addiction recovery provider on the Treasure Coast (and beyond), serving 15,000 children and adults annually through inpatient crisis services, 24-hour help line and mobile response team, and outpatient programs conveniently located across Indian River, Martin, Okeechobee and St. As a Mobile Responder, your Primarily role is to respond to MRT/211 calls for crisis intervention services in any setting in which a behavioral health crisis is occurring, including at schools, homes, emergency rooms, or other areas as assigned by the Team Leader, Program Manager, or Division Director.