New York City Internist - Christopher L. Barley, M.D. - Internal Medicine Doctor - Travel Medicine Manhattan, NYC Internist - Board certified internal medicine specialist located in Manhattan, New York City with specific interests in the prevention and early detection of diseases. His specialty services include house calls, care of chronic illnesses, physical exams, travel medicine and vaccinations, and executive/corporate health care. He has accumulated a network of the best physicians both in NYC and most countries in the world.