At Sovereign Associates, Inc. they bring a wealth of knowledge and integrity to your next apartment search. Principal Broker Gregory Healy has more than twenty years of experience in Manhattan neighborhoods, including the Columbia University area. Their agency has a proven track record of connecting clients with great properties located in the following: The Upper West Side, Morningside Heights & Columbia University Area, Harlem (including Hamilton Heights & Manhattanville / West Harlem), Washington Heights (including Hudson Heights), and Inwood & Marble Hill.