The Union League of Philadelphia   

Heterodox Academy

National Association for the Advancement of Colored People

The Organization of American Historians

American Historical Association

The Society for Historians of the Early American Republic

The Society of Civil War Historians

Easttown Township (Pennsylvania) Planning Commission (2000-2004)

Board of Directors, The Abraham Lincoln Association (2000- present)

Board of Directors, The Abraham Lincoln Institute (1998- present); president 2013-2014

Gilder Lehrman Institute of American History Advisory Board

Gilder Lehrman Lincoln Prize Advisory Council

Appointee of President George W. Bush, on the National Council for the Humanities from 2006 to 2012

National Council on the Humanities

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