 He became a lecturer at the Charles University in 2009 and was appointed there to a full professorship in 2011.Feireisl spent in 1989 half a year in Oxford, in 1993/94 a sabbatical year at the Complutense University of Madrid, and in 1998 and in 1999 half a year at the University of Franche-Comté in Besançon.He was also as visiting scholar for 12 months from 2001 to 2013 at Henri Poincaré University in Nancy and for 3 months in 2000 at Ohio State University.