Professor, Physics & Astronomy, College of Arts and Sciences, Northeastern Illinois University (past)
Chair, Physics & Astronomy, College of Arts and Sciences, Northeastern Illinois University (past)
Professor, Chemistry Department, College of Arts and Sciences, Northeastern Illinois University (past)
Chair, Chemistry Department, College of Arts and Sciences, Northeastern Illinois University (past)
Chair, Department of Earth Science, College of Arts and Sciences, Northeastern Illinois University (past)