With more than 50 Columbia-affiliated providers and multiple locations throughout Westchester, Rockland, and Orange Counties, including Valhalla, Hawthorne, White Plains, Yonkers, Scarsdale, Suffern, and Monroe, we’re committed to delivering exceptional patient care across the region. AMP is a Management Services Organization (MSO) that provides clinical and administrative support to ColumbiaDoctors, one of the largest and most respected multi-specialty practices in the Northeast.