In 1993, Hogan was elevated to be the chair of the Department of History at Ohio State, which position he held until he moved into the administrative side of academia.

[6] As president, Hogan helped develop a $362 million plan to renovate and expand the University of Connecticut Health Center.

Research spending grew by 25%, and academics and enrollment continued to pursue the upward trajectory established under President Austin.

He refused to move into the official president's house in Storrs because his wife, Virginia, allegedly had a severe allergic reaction to mold and mildew there.

[8] He ordered a $475,000 renovation of the university's main administrative building, where he worked, and he hosted a costly inauguration ceremony for himself, complete with fireworks.

At the start of his position at Illinois, Hogan has been criticized for big salary raises to the members of his administrative team at the time of severe budget problems for the university and the state.

In the summer of 2011, a university law employee was dismissed following evidence that he changed the grades of several students to make the U of I rank higher in the national standards.

[18] Hogan has been credited with putting together a university budget for the 2011–12 academic year that provided the first program of merit-based salary raises for the faculty since 2008.

In the released emails, Hogan indicated that he expected Wise to be an advocate for the Board of Trustees, rather than the Urbana-Champaign Campus directly and was disappointed that she did not display the type of leadership that he was looking for.

His publications include Informal Entente: The Private Structure of Cooperation in Anglo-America Economic Diplomacy, 1918–1928 (University of Missouri, 1977) and The Marshall Plan: America, Britain, and the Reconstruction of Western Europe, 1947–1952 (Cambridge, 1987), which received the Stuart L. Bernath Book Award of the Society for Historians of American Foreign Relations, the 1988 George Louis Beer Prize of the American Historical Association,[32] and the Quincy Wright Prize of the International Studies Association.

President Hogan served for 15 years as editor of Diplomatic History, an international journal of record for specialists in diplomacy and foreign affairs.

He has also served on the U.S. Department of State Advisory Committee on Diplomatic Documentation, which he chaired for three years, and has worked as a consultant for a number of BBC documentaries and for the PBS special George C. Marshall and the American Century.

President Hogan has been a fellow at the Harry S. Truman Library Institute and the Woodrow Wilson International Center for Scholars, and has served as Louis Martin Sears Distinguished Professor of History at Purdue University.