December 2005 - December 2006:
Visiting Professor, Einstein Institute of Mathematics, The Hebrew University of Jerusalem, Israel.
August 2003 - present:
Associate Professor, Department of Mathematics, University of Nebraska at Omaha, Omaha NE.
August 2002 - January 2003:
Visiting Assistant Professor, Department of Mathematics, University of Northern Iowa, Cedar Falls, IA.
August 1999 - July 2003:
Assistant Professor, Department of Mathematics, University of Nebraska at Omaha, Omaha NE.
August 1997 - July 1999:
Visiting Assistant Professor, Department of Mathematics and Computer Science, Boise State University, Boise ID.
October 1993 - June 1997:
Postdoctoral Fellow, The Hebrew University of Jerusalem, Jerusalem, Israel.
October 1991 - May 1999:
Assistant Professor, Mathematical Institute of the University of Wroclaw, Poland.
October 1991 - September 1993:
Postdoctoral Fellow, Bar-Ilan University, Ramat Gan, Israel.
June 1986 - October 1991:
Teaching Assistant, Mathematical Institute of the University of Wroclaw, Poland.
May 1985 - May 1986:
Military Service.
October 1984-May 1985:
Junior Teaching Assistant, Mathematical Institute of the University of Wroclaw, Poland.