+ Professor of physics, Boston University 2008-
+ Associate professor of physics, Boston University 2004-2008
+ Academy of Finland senior research fellow, Åbo Akademi University, 2000-2004
+ Visiting research assistant professor, University of Illinois at Urbana-Champaign, 1999-2000
+ Visiting scholar, Center for Nonlinear Studies, Los Alamos National Laboratory, 1998-99
+ Postdoctoral research associate, University of Illinois at Urbana-Champaign, 1996-99
+ Postdoctoral research associate, Florida State University, Tallahassee, 1994-96
+ Postdoctoral research associate, University of California, Santa Barbara, 1993-94
+ Ph.D. in Physics, University of California, Santa Barbara, 1993
+ Fil. Kand. (M.Sc.) in Physics, Åbo Akademi University (Finland), 1989