Henry worked as a staff assistant at the Public Administration Clearing House in Chicago and Washington, DC, from 1950 to 1955. Henry was regarded as an expert on
United States presidential transitions. He was the primary research associate for the Brookings Institution 1960 - 1961 Study on Presidential Transition. In addition to contributing to various publications, Henry wrote
Presidential Transitions in 1960 and
The Presidential Election and Transition, 1960 – 1961 in 1961 (the latter being written in collaboration with P.T. David). In 1961, his doctoral
dissertation on the subject received the
Leonard D. White Award. From 1964 through 1978, Henry was a professor of government and foreign affairs at the
University of Virginia. Henry also served as a consultant to the Alaska State Commission. He was also a contributor and board member of the Inter-University Case Program, producing materials for educating on the subject public administration that have been described as "pioneering". ==Personal life and death==