Sasha Alexander, D.D.S. Education. Columbia University in the City of New York College of Dental Medicine, New York, NY: Postgraduate Endodontics Certificate, June 2011 Rush University Medical Center, Chicago, IL: General Practice Residency (GPR) GPR Certificate, July 2010 State University of New York at Buffalo School of Dental Medicine, Buffalo, NY: Doctor of Dental Surgery, May 2007 (magna ....