John J. Hennessy is an author and historian who has dedicated his career to the National Park Service. He is now chief historian at the Fredericksburg and Spotsylvania National Military Park. He sat down with Colin for a talk at Chatham, a colonial mansion that overlooks the historic city of Fredericksburg. John discusses how he got involved in the NPS, his books on the battles of First and Second Bull Run, and how historians navigate the sometimes choppy political waters surrounding history.

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