| 2003 - Present | Director of Center for Welding, Joining and Coatings Research (CWJCR) | Colorado School of Mines |
| 1995 - Present | Professor in Metallurgical Engineering | Colorado School of Mines |
| 1990 - 1995 | Associate Professor in Metallurgical Engineering | Colorado School of Mines |
| 1987 - 1990 | Assistant Professor in Metallurgical Engineering | Colorado School of Mines |
| 1984 - 1987 | Assistant Professor in Industrial & Manufacturing Engineering | The Pennsylvania State University,
University Park Campus |
| 1980 - 1984 | Graduate Research Assistant | Center for Welding Research -
Colorado School of Mines |
| 1977 - 1980 | Steel Research Metallurgist I & II | Acesita - Specialty Steels of
Itabira, Brazil |
| 1973 - 1976 | Instructor of Analytical Chemistry | Escola Técnica Federal
de Minas Gerais, Brazil |
| 1972 | Chemical Analyst | Krome Industrial, S.A./ETFMG,
Brazil |