▁three ▁years ▁after ▁comple ting ▁his ▁studies ▁in ▁dent istry ▁at ▁the ▁Royal ▁D ental ▁Hospital ▁( R D H ), ▁he ▁obtained ▁his ▁fellow ship ▁in ▁dent al ▁surg ery ▁of ▁the ▁Royal ▁College ▁of ▁Sur ge ons ▁of ▁England . ▁ ▁With ▁an ▁interest ▁in ▁period ont ology , ▁between ▁ 1 9 5 6 ▁and ▁ 1 9 6 2 , ▁he ▁worked ▁in ▁the ▁depart ments ▁at ▁the ▁East man ▁D ental ▁Hospital , ▁Guy ' s ▁Hospital ▁and ▁the ▁R D H . ▁At ▁the ▁time ▁the ▁subject ▁was ▁still ▁in ▁its ▁inf ancy ▁in ▁the ▁UK . ▁Although ▁in ▁the ▁US ▁the ▁special ity ▁was ▁long ▁established , ▁the ▁first ▁British ▁academic ▁department ▁was ▁only ▁set ▁up ▁in ▁ 1 9 4 8 ▁at ▁the ▁East man ▁D ental ▁Hospital , ▁under ▁W . ▁G . ▁Cross . ▁ ▁He ▁went ▁to ▁America ▁in ▁ 1 9 6 2 ▁on ▁a ▁post - grad uate ▁fellow ship ▁to ▁study ▁at ▁the ▁University ▁of ▁Pennsylvania ▁Department ▁of ▁Period ont ics . ▁There ▁he ▁came ▁under ▁the ▁influence ▁of ▁period ont ologist ▁D . ▁Walter ▁C ohen . ▁ ▁Return ▁to ▁London ▁and ▁senior ▁posts ▁On ▁his ▁return ▁to ▁the ▁UK , ▁Zam et ▁was ▁appointed ▁senior ▁lect urer ▁at ▁the ▁R D H , ▁and ▁later ▁consult ant ▁in ▁period ont ology ▁at ▁University ▁College ▁Hospital ▁( U CH ) ▁D ental ▁School . ▁After ▁the ▁closure ▁of ▁the ▁U CH ▁school ▁Zam et ▁moved ▁to ▁the ▁East