After graduating from dental school, Dr. Sas attended the Forsyth Institute (affiliated with Harvard School of Dental Medicine) in Boston where he completed a general residency program. In 1981, he completed his post graduate training in endodontology under Dr. Samuel Seltzer at Temple University in Philadelphia. York Hill Endodontics was founded in 1965 and in 1981, Dr. George Sas joined the practice and it is now the longest established endodontic specialty practice in Canada.