Sean J Cloonan, MD earned a B.A. in literature from Harvard University before attending the School of Medicine at New York University. Dr Cloonan completed his internship and residency in internal medicine at New York University (NYU) and a sub-specialty fellowship in infectious diseases also at NYU, where he was Fellow of the Year. He is board-certified in internal medicine and infectious diseases. Previously, Dr Cloonan was a clinical instructor at New York University and engaged in research at NYU and the Manhattan VA. He has been on staff at several hospitals throughout Westchester and New York City.