Appointments
- Professor, School of Information, University of Texas at Austin, 1996 to present.
- Associate Professor, Graduate School of Library and Information Science, University of Texas at Austin, 1981‑1996.
- Assistant Professor, Graduate School of Library and Information Science, University of Texas at Austin, 1975‑1981.
- Assistant Professor and Coordinator, Library Science Education (undergraduate program). College of Library and Information Services and College of Education, University of Maryland, College Park, 1972‑74. (Joint appointment).
- Instructor of Library Science, College of Education, Louisiana Tech University, Ruston, Louisiana, 1964‑69.
- Reference Librarian (Circulation, Reference, and Government Documents Supervisor). Austin College, Sherman, Texas, 1964.
- Librarian. Seguin High School, Seguin, Texas, 1961‑63.