- American Library Association
- ALA Treasurer, 2010-13
- ALA Website and Links Task Force, 1999-2000
- Book Censorship Rapid Response Team, 2021-2022
- Budget Analysis and Review Committee, 2008-16, Chair, 2008-10
- Committee on Organization, 2019-21, 2021-23, Chair 2020-21, 2021-22
- Conference Program Committee, 1992-93
- Congress on Professional Education (Continuing Professional Development, COPE-2) Steering Committee, Chair 2000-02
- Council, 1994-2001, 2010-13, 2013-16, 2016-19, 2019-22
- Endowment Trustees, 2010-13, 2019-22
- Executive Board, 1997-2001, 2010-13, 2013-16, 2016-19
- Board Effectiveness Committee, 2013-16, 2016-19
- Executive Committee, 2010-13, 2016-19
- Finance and Audit Committee, 2008-13, Chair 2010-13, 2013-2016
- Partnership and Sponsorship Committee, 2010-13
- Executive Director Search Committee, 1993-94, 2000-01, 2017-19
- Forward Together Resolutions Task Force, 2021
- Fundraising Advisory Committee 2011-13
- Google Settlement Task Force, 2010-11
- International Relations Committee, 1990-96, 2005-07
- East Asia/Pacific Subcommittee, 2005-07
- Lois Ann Gregory-Wood Fellowship Committee, 2017-21
- New Business Development Advisory Committee, 2020-22
- Office for Information Technology Policy (OITP)
- Copyright Advisory Committee, 1998-2002, Chair 2001-02
- Information Policy Revolution! Library Advisory Committee, 2013-15
- Task Force on Digitization Policy, 2006-07
- Policy Corps Advisory Committee, 2017-21
- President Advisory Committee, 1994-95, 2005-07
- Steering Committee on Organizational Effectiveness, 2018-20
- Uniform Computer Information Transactions Act (UCITA) Task Force, 2000-03
- Association of American Universities, Intellectual Property/Information Technology Committee, 1997-21
- Association of College and Research Libraries (ALA)
- ACRL 2017 National Conference Planning Committee, Chair 2015-17
- College and Research Libraries Editorial Board, 1990-96
- Heads of Public/Reader Services Steering Committee, 1983-86
- National Conference Fundraising Committee, 2003-05, 2005-07, 2007-09, 2009-11, 2011-13
- President's Program Planning Committee, 2004-06
- Program Planning Committee, 1988-89
- Scholarly Communications Committee, 2002-06
- Task Force on Positioning the 21st Century Library in the Competitive Academy, 2007-08
- University Libraries Section, Policy and Planning Committee, 1988-90
- Value of Academic Libraries Committee, 2011-12
- Association of Research Libraries
- Advisory Committee on the Office of Management Services, 1991-92
- Board of Directors, 1994-99, 2006-09, President 1997-98
- Executive Committee, 1996-99
- Executive Director Search Committee, 2007
- Influencing Public Policies Steering Committee, 2013-16
- Information Policies Committee, 1992-96, Chair 1993-96
- Intellectual Property and Copyright Committee, 1994-2005, Chair 1994-99
- Leadership and Career Development Program, 1997-99, 2007-09, 2009-11, 2012-14
- Leadership Development Program Work Group, 2015
- Leadership Development Task Force, 2006-07
- Membership Committee, Chair 2000-01
- Nominations Committee, Chair 1997, 2000, 2011
- Research Library Leadership Fellows Program, 2005-06
- Scholarly Communication Committee, 2002-04
- Scholarly Communication Steering Committee, 2005-09, Chair 2007-09
- SPARC Working Group, 1997-98
- Strategic Plan Review Task Force, 2008-09
- Strategic Thinking and Design Work Group, 2014
- Task Force on Governance, 2004
- Task Force on International Interlibrary Loan and Document Delivery Practices, 2011
- Transforming Research Libraries Steering Committee, 2009-12
- Baltimore Community Foundation, Commission on the Current State and Future Development of Finances for the Pratt Library, 1996-97
- Berkeley Law Digital Library Copyright Project, Advisory Board, 2011-13
- Bottom Line: Managing Library Finances, Editorial Advisory Board, 1993-98
- College of Physicians of Philadelphia, Committee on Library, Museum, and Wood Institute, 2010-11
- Center for Research Libraries
- Global Resources Network Committee, 2008-12
- Nominating Committee of the Board of Directors, 2002
- Committee on Institutional Cooperation (CIC/Big 10)
- Director of Center for Library Initiatives Search Committee, 1993-94
- Library Directors Council, 1989-95
- Planning Taskforce, 1991-95
- Virtual Electronic Library Project Steering Committee, 1993-95
- Council on Library and Information Resources
- DLF Program Advisory Committee, 2010-12
- DLF Senior Program Officer Search Committee, 2010
- Preservation Committee, 2006
- Council of Pennsylvania Library Networks, Chair 1985-87
- CrossRef, Library Advisory Board, 2002-06
- Digital Library Federation
- Board of Trustees, 2005-09
- Membership Committee, 2008-09
- Organizational Review Committee, 2008-09
- Steering Committee, 2001-05
- Task Force on Organization and Governance, Chair, 2004-05
- Transition to CLIR Committee, 2009
- Digital Preservation Network
- Board of Trustees, 2013-14
- Succession Rights Working Group, Chair 2012-13
- Digital Public Library of America, Legal Workstream, Co-Chair 2011-13
- Elsevier North American Library Advisory Board, 2006-10
- Empire State Digital Network Advisory Committee, 2014-16
- Evergreen Historical House and Museum, Baltimore, Board of Directors, 1997-2001
- Freedom to Read Foundation
- 50th Anniversary Planning Committee, 2018-19
- Board of Directors, 2005-09, 2010-12, 2013-15, 2015-17, 2019-21
- Executive Committee, 2007-09, 2013-15, 2015-17, 2019-21
- Fundraising Committee, 2018-22
- Membership Committee, 2005-09, 2010-12, 2013-15, 2020-2022
- Nominating Committee, 2010, Chair 2011
- Treasurer, 2007-09, 2013-15, 2015-17, 2019-21
- HathiTrust Research Center, Board of Advisors, 2011-14
- Indiana Council on Library Automation, 1991-93
- Indiana Cooperative Library Services Authority (INCOLSA), Board of Directors, 1989-92
- Indiana State Library Advisory Committee, 1993-95
- Indiana State Network Study Committee, 1993-94
- Indiana Statewide Library Automation Planning Task Force, Chair 1989-90
- Indiana State University Library Automation Network (SULAN), Board, 1989-95, Chair 1990-91 and 1994-95
- International Federation of Library Associations
- Committee on Copyright and Other Legal Matters, 1998-2014, Expert Advisor, 2015-21
- Corporate Partners Council, Chair 2004-07
- IFLA 2001 National Organizing Committee, 1996-2002
- IFLA 2001 Resource Development Subcommittee, Chair 1996-2002
- IFLA 2016, Scholarship Fundraising Committee, Co-Chair, 2014-16
- Section Committee on Academic and Research Libraries, 2013-2017
- Section Committee on Interlending and Document Delivery, 1992-2001
- Section Committee on University Libraries and Other General Research Libraries, 2003-07, 2007-11
- International Relations Round Table (ALA)
- Chair-Elect, 2020-21
- Chair, 2021-22
- Executive Committee, 2020-23
- Ivy-Plus Chief Information Officers Group, 2001-05
- Ivy-Plus Library Directors Group, 2001-14
- Journal of Library Administration, Editorial Board, 1995-2013
- Library Administration and Management Association (ALA)
- Assistants to the Director Discussion Group, Chair 1983-84
- Board of Directors, 1990-94, President 1992-93
- Budget and Finance Committee, Chair 1990-91
- Editorial Advisory Committee, 1990-94
- Executive Committee, 1991-94
- Middle Management Discussion Group, Chair 1984-85
- National Conference Planning Committee, 1987-89
- Personnel Administration Section, Executive Committee, 1985-88, Chair 1986-87
- Personnel Administration Section, Publications Committee, 1987-89
- Personnel Administration Section, Staff Utilization and Economic Status Committee, Chair 1985-88
- Program Committee, 1984-88, Chair 1986-88
- Library Information Technology Association/Library Administration and Management Association National Conference, Pittsburgh, 13-16 October 1996
- Networking/Technology Committee, Chair 1994-97
- Steering Committee, 1994-97
- Library of Congress
- Bernstein Digital Library Project Committee, 1994-95
- National Coordinated Cataloging Project Committee, 1990-93
- Maryland Advisory Board of the National Historical Publications and Records Commission, 1996-2001
- Metropolitan New York Library Council (METRO)
- Board of Trustees, 2011-14, 2014-17, 2017-20
- Treasurer, 2015-17
- Mount Vernon Cultural District, Baltimore, Board of Directors, 1999-2001
- National Information Standards Organization (NISO)
- Board of Directors, 2004-09, Chair 2007-08
- Executive Committee, 2006-09
- National Institutes of Health, PubMed Central National Advisory Committee, 2000-02
- New York Center for the Book, Board of Directors, 2002-07
- New York Historical Society, Vice President and Library Director Search Committee, 2004
- New York Times, Academic Librarian Awards Jury, 2006-07
- OCLC
- Board of Trustees, 2010-13, 2014-17, 2018-21
- Board Audit Committee, 2013, 2014, 2018
- Board Committee on Finance and Investments 2010-12, 2017-21, Chair 2019
- Board Committee on Nominating and Board Development, 2010, 2015-16
- Board Committee on Personnel and Compensation, 2011-16, 2020-21, Chair 2013-16
- Board Committee on RLG Programs, 2006-11, Chair 2010-11
- Board Executive Committee, 2013, 2014, 2015, 2016, 2017, 2018, 2019
- Board Technology Committee, 2020-21
- CEO Search Committee, 2011-12
- Institute for Museum and Library Services (IMLS), REALM Project Executive Steering Committee, 2020-21
- Research Libraries Advisory Committee, 1992-98, Chair 1996-97
- RLG Program Council, 2006-10
- Open Knowledge Commons, Board of Directors, 2009-12
- Pennsylvania Governor's Advisory Council on Library Development, 1987-89
- Pennsylvania Library Association
- Elections and Nominations Committee, 1985-86
- Library Administration and Management Roundtable, Chair 1987-89
- Publications and Research Materials Committee, 1985-87
- Pennsylvania Preservation Planning Task Force, 1987-88
- Pennsylvania Regional Library Resource Centers Board, 1983-88
- Pittsburgh Regional Library Center
- Board of Trustees, 1983-88
- Executive Committee, 1984-85
- Executive Director Search Committee, 1985
- Personnel Policies Review Committee, Chair 1986-87
- Strategic Planning Committee, 1986-87
- Portal: Libraries and the Academy, Editorial Board, 2000-15
- Pratt Library (Baltimore), Maryland SAILOR Project Advisory Board, 1997-2001.
- Research Collections and Preservation Consortium (ReCAP)
- Board of Governors, 2001-14
- President, 2004-14
- Research Libraries Group
- Board of Directors, 2003-06, Chair 2003-06
- Public Services Committee, 1986-88
- Research Libraries Group/Commission on Preservation and Access, Task Force on Archiving of Digital Information, 1994-95
- Scholarly Publishing and Academic Resources Coalition (SPARC)
- Nominating Committee, Chair 2007
- Steering Committee, 2000-05, Chair 2002-05
- United States Copyright Office, Copyright Act Section 108 Study Group, 2005-08
- University of the People, Libraries Advisory Board, 2010-20.