Organizational Affiliations and Advisory Boards
- member of the American Antiquarian Society
- member of the Maryland Historical Society, and served for a number of years on the editorial board of the Maryland Historical Magazine
- served on the American Historical Association's Committee on the American Revolution Bicentennial, and review panels for the National Endowment for the Humanities
- Coordinator of the Maryland Advisory Board of the National Historical Publications and Records Commission
- former member of the National Historical Publications and Records Commission as the representative of the Society of American Archivists
- member of the advisory board of The Johns Hopkins University Medical Archives.
- member of the Baltimore Bibliophiles
- member of MARAC, Mid-Atlantic Regional Archivists Conference, of which he was a founding member
- member of the Advisiory Board of the Friends of the Johns Hopkins University Library
- member of the Advisory Board of the College of Library and Information Services (CLIS), University of Maryland
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