▁and ▁reconst ruction al ▁surg ery ▁( 1 9 9 8 ) ▁and ▁on col ogy ▁( 2 0 0 9 ). ▁ ▁From ▁ 1 9 6 9 ▁he ▁worked ▁in ▁the ▁Institute ▁of ▁Medical ▁Chem istry ▁of ▁the ▁University ▁of ▁Sz eg ed ▁as ▁demonstr ator ▁and ▁from ▁ 1 9 7 1 ▁in ▁the ▁Micro bi ology ▁Institute ▁as ▁a ▁T DK ▁member . ▁He ▁became ▁a ▁clin ical ▁phys ician ▁in ▁ 1 9 7 4 ▁at ▁the ▁Nr ▁ 2 ▁Sur geon ▁C lin ic ▁and ▁from ▁ 1 9 7 8 ▁instruct or . ▁ ▁He ▁came ▁to ▁the ▁National ▁On colog ical ▁Institute ▁in ▁ 1 9 8 1 ▁where ▁he ▁became ▁lect urer ▁in ▁ 1 9 8 4 ▁and ▁chief ▁medical ▁officer ▁of ▁the ▁head - ne ck ▁surg ery ▁department ▁in ▁ 1 9 8 6 . ▁He ▁was ▁nominated ▁to ▁director ▁of ▁the ▁inst itute . ▁He ▁established ▁the ▁National ▁Can cer ▁Control ▁Program ▁for ▁the ▁heter ogeneous ▁medical ▁care ▁of ▁cancer ▁patients ▁in ▁ 1 9 9 3 . ▁ ▁Since ▁ 1 9 9 4 ▁he ▁became ▁professor ▁at ▁the ▁Sem mel weis ▁University ▁and ▁Head ▁of ▁Department ▁on ▁three ▁univers ities ▁( Sem mel weis ▁University , ▁University ▁of ▁P é cs , ▁University ▁of ▁Medicine ▁and ▁Ph arm acy ▁of ▁T âr gu ▁M ure ș ) ▁since ▁ 1 9 9 8 . ▁Since ▁ 2 0 0 7 ▁he ▁was ▁director ▁of ▁the ▁on colog ical