- 2006-Present - Lecturer, Department of Mathematical Sciences, The University of Texas at El Paso, El Paso, Texas, USA.
- 2020-Present - Lecturer, Department of Computer Science, El Paso Community College, El Paso, Texas, USA.
- 1995-2010 - Institute of Theoretical Mechanics, Department of Civil Engineering, Silesian University of Technology in Gliwice, Poland.
- 1995-2001 - Lecturer and Ph.D. Student
- 2001-2010 - Assistant Professor (2006-2010 - sabbatical leave)
- 2020 - Summer Faculty Research Fellowship sponsored by the U.S. Department of Defense.
- 2006 - Postdoctoral Position (Researcher), Bergen Language Design Laboratory (BLDL),
Department of Computer Science, The University of Bergen, Bergen, Norway.
Project: SAGA - Scientific Computing with Algebraic and Generative Abstractions.
Supervisor: Prof. Magne Haveraaen.
- 2003 - Postdoctoral Position (Researcher), Department of Mathematics,
Faculty of Natural Sciences and Mathematics, University of Vienna, Vienna, Austria.
COCONUT Project - COntinuous CONstraints - Updating the Technology.
Supervisor: Prof. Arnold Neumaier.
- 2002 - Research Engineer, Chevron Corporation, San Ramon, California, USA.