Currently: Research Assistant Professor at Missouri State University, USA.
2005-2006 Research Assistant Professor at Kansas State University, USA
2003-2005 Postdoctoral Researcher at Kansas State University, USA.
1999-2003 Postdoctoral Researcher at Washington State University, USA
1997-1999 Postdoctoral Research Fellow at National Tsing-Hua University, Taiwan
1996-1997 Senior researcher at Research Institute of Forestry, Warsaw, Poland.
1987-1995 Teaching researcher at Faculty of Biology, University of Warsaw, Poland