Goshen Medical Associates is a proud member of the Bon Secours Medical Group and is now a part of the Westchester Medical System Dr. Lidia Koulova, MD Dr. Lesley Stead, MD Dr. Salvatore DeVincenzo, MD Dr. Alan Schaffer, MD Dr. Petr Bezdicek, MD Dr. Deogenes G. de León, MD Dr. Alan Schaffer, MD Dr. Deogenes G. de León, MD Dr. Alan Schaffer, MD.