Columbia University (New York, NY)

• University Librarian Emeritus, 2015-
  
• Vice President for Information Services and University Librarian, 2001-14

Johns Hopkins University (Baltimore, MD)

• Dean of University Libraries, 1998-2001
• Sheridan Director, Milton S. Eisenhower Library, 1995-2001

Indiana University (Bloomington, IN)

• Dean of University Libraries, 1989-1995
• Adjunct Professor, School of Library and Information Science, 1989-1994

Pennsylvania State University (State College, PA)

• Assistant Dean and Head, Reference and Instructional Services Division, University Libraries, 1983-1989
• Council on Library Resources, Academic Library Management Intern, 1981-1982

University of Notre Dame (South Bend, IN)

• Assistant Director for Memorial Library Public Services, 1982-1983
• Head of the Collection Management Department, 1979-1981
• Head of the College Library Department, 1977-1979

Queensborough Community College of the City University of New York (Bayside, NY)

• Social Sciences Librarian, 1973-1976