Whakakihia te rerenga e whai ake nei: I whakapau a Zieleniec i te nuinga o tana mahi ngaio hei kaipōti ohanga. Mai i te tau 1973 tae noa ki te
I te hinganga o te kawanatanga Communist i te tau 1989, i mahi ia i te tuatahi hei kairangahau rangahau i te Institute of Research in Engineering Technology and Economics Research, ana i muri mai i te Institute of Economics of the Czechoslovak Academy of Sciences. I tua atu i te rangahau i roto i te ariā microeconomic, i mahi ia i runga i nga raruraru o te whakawhitinga ohaoha mai i te whakamahere matua ki te ohaoha o te maakete. Ko te rangahau "Czechoslovakia i te huarahi", i runga i tana rangahau, he nui te paanga ki nga korerorero mo nga whakahoutanga ohaoha i muri i te 1989.