Research assistant University Iowa, Iowa City, 1979-1981, assistant research scientist, 1981-1983, adjunct assistant professor, 1983-1988, adjunct associate professor, since 1988. Adjunct assistant professor University Denver, 1984-1986. Assistant adjunct professor University Colorado, Boulder, 1984-1993, adjunct associate professor, 1993-1996.
Research scientist Denver Center Performing Arts, 1983—1988, senior scientist, 1988—1996. Lecturer voice and speech science National Theatre Conservatory, 1990-1994. Assistant clinical professor School Medicine University Colorado, 1988—1996.
Associate professor Bowling Green State University, Ohio, 1996—2001, professor, 2001—2005, since 2006. Adjunct associate professor University Oklahoma, 1992-1996. Affiliate clinical professor University Northern Colorado, 1993-1996.
Oberlin College affiliate scholar, since 1996. Member executive and legislation board National Center Voice and Speech, 1990-1996. Adjunct professor Drexel University, Philadelphia, since 2006.
G. Paul Moore lecturer, The Voice Foundation, 2002. Research professor University Cincinnati, 2005-2006.
- Vocal Fold Physiology: Biomechanics, Acoustics and Phonatory Control - Proceedings of the International Conference on Physiology and Biophysics of the Voice, University of Iowa, Iowa City, Iowa, May 4-7, 1983
Fellow: International Society Phonetic Sciences (auditor 1988-1991). Member: American Association Phonetic Sciences (nominating committee 1985-1987, counselor 2000-2003, councelor 2000-2003), International Association Logopedics and Phoniatrics, Acoustical Society of America, American Speech-Language-Hearing Association, International Arts Medicine Association, Collegium Medicorum Theatri, Sigma Xi, Pi Mu Epsilon (G. Paul Moore lecturer).