Ka cika wannan jumla: An sake shi daga kurkuku a shekara ta 1960 a matsayin wani ɓangare na afuwa. Shi da matarsa sun yi hijira zuwa Burtaniya bayan mamayewar Warsaw Pact na Czechoslovakia a 1968, wanda ya murkushe Prague Spring. Krejci ya zama farfesa a fannin ilimin zamantakewa a Jami'ar Lancaster. Ya koyar a Jami'ar Jami'ar Nazarin Faransanci, Nazarin Jamus da Nazarin Addini daga 1969 zuwa 1983. Yawancin bincikensa sun mai da hankali kan tarihi da kuma samar da wayewa daga tsarin macrosociological. Ya koma Czechoslovakia da Jamhuriyar Czech bayan
faduwar kwaminisanci don koyarwa a Jami'ar Charles a Prague da Jami'ar Palacký, Olomouc, da kuma Cibiyar Diplomacy ta Vienna.