Entomologist Plant Protection in Prague (1951- 1956), Hymenopterist of the National Museum in Prague (1956-1969), Principal taxonomist of the I.E.E. in Natural History Museum in London (1970-1988).Chalcidoidea world specialist who has published : European Chalcididae (1952), key to genera of Czechoslovak Hymenoptera (1957), Leucospidae of the world (1974), Yugoslavian fauna of Chalcidoidea (1977) Australasian Chalcidoidea (1988). He has been living in Great Britain since 1970.