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, AMP supports a broad range of specialties, including Cardiology, Vascular Disease, Internal Medicine, Obesity Medicine, Gastroenterology, and Endocrinology. Ambulatory Medical Practices MSO, Inc. (AMP) is a Management Services Organization that provides clinical and administrative operational support for ColumbiaDoctors, one of the largest and most respected multi-specialty medical practices in the Northeast.