Tufts University, Professor – Dept. Physics & Astronomy, 9/02 -present Associate Professor – Dept. Physics & Astronomy, 7/95 –9/02 Massachusetts Institute of Technology, Associate Professor – Dept. Materials Science & Eng., 1/93 – 6/95 Assistant Professor – Dept. Materials Science & Eng., 1/88 – 1/93 Caltech-NASA Jet Propulsion Laboratory, Technical Group Leader – Polymer Physics Group, 5/87 – 12/87 Member Technical Staff, 1/86 – 12/87 Research Associate, 1/84 – 12/85 Cornell University, Graduate Research Assistant, 1979-83 Graduate Teaching Assistant, 77-79 City of Erie Public Schools, Secondary School Teacher, 1975-77 Mercyhurst Preparatory School, Erie, PA, Science Department Head, 1973-75 Secondary School Teacher, 1970-75