1990-	Professor, Graduate School of Library and Information Science, The University of Texas at Austin
May 2001	Visiting Professor, School of Library and Information Science, University of Arizona, Tucson
1978-90	Associate Professor, Graduate School of Library and Information Science, The University of Texas at Austin
Spring, 1982	Visiting Associate Professor, Graduate School of Library Studies, The University of Hawaii
Summer, 1977	Visiting Associate Professor, Graduate Library School, Indiana University
1969-77	Assistant Professor and Lecturer, Graduate School of Library and Information Science, The University of Texas at Austin (excluding 1970-71)
1964-69	Reference Librarian for the Southwest Center for Advanced Studies, Southern Methodist University, Dallas, Texas. (Specialized in science reference, sci-tech literature searching, and document delivery.)
1964	Library Intern, NASA-Lyndon B. Johnson Space Center, Houston, Texas
1960-62	Chemist, Dow Chemical Co., Midland, Michigan. (Specialized in carbohydrate and enzyme chemistry.)

Recent Administrative Service

School of Information 
(Formerly Graduate School of Library and Information Science)

1989-91, 2001-2003	Graduate Adviser
1989-90, 1998-99, 2000-01	Dean Selection Committees for the School of Information
1988-95, 1996-98, 2000-01	Executive Committee
1984-88, 1995-2000	Faculty Senate/University Council
1995-96	Council for International Exchange of Scholars (CIES), Russian Junior Faculty Development Program