Dr. Fred Greenstein, emeritus professor at Princeton University and noted presidency scholar, was a guest speaker in Dr. Adam Warber’s American Presidency class on March 28, 2013 to discuss his book The Presidential Difference: Leadership Style from FDR to Barack Obama. He also gave a research presentation later in the day to Clemson faculty and graduate students that focused on his classic book (coauthored with John P. Burke), How President’s Test Reality: Decisions on Vietnam, 1954 & 1965. This work, which received the American Political Science Association’s Richard E. Neustadt presidency book award in 1990, assesses the decision making process that occurred in the Dwight Eisenhower and Lyndon Johnson administrations regarding American foreign policy in Vietnam. Specifically, it analyzes the influence of presidential advisory systems, presidential leadership, and the political environment on White House decisions with respect to Vietnam. Dr. Greenstein is the author of numerous influential books in political science including Children and Politics (1965), Personality and Politics (1969), The Hidden-Hand Presidency: Eisenhower as Leader (1982), Inventing the Job of President: Leadership Style from George Washington to Andrew Jackson (2009), and Presidents and the Dissolution of the Union: Leadership Style from Polk to Lincoln (2013). In addition, his work has appeared in numerous academic journals including the American Political Science Review, Journal of Politics, Political Science Quarterly, Presidential Studies Quarterly, Public Opinion Quarterly, World Politics, Political Psychology, and the British Journal of Political Science. Dr. Greenstein’s campus visit was sponsored by both the Department of Political Science and the Ph.D. Policy Studies program.