John Adalbert Lukacs (born 31 January 1924 in Budapest; in Hungary his name spelled Lukács) is a Hungarian-born American historian who has written more than twenty-five books, including Five Days in London, May 1940 and A New Republic. He was a professor of history at Chestnut Hill College (where he succeeded Erik von Kuehnelt-Leddihn) from 1947 to 1994, and the chair of that history department from 1947 to 1974. He has served as a visiting professor at Johns Hopkins University, Columbia University, Princeton University, La Salle University, and at the Eötvös Loránd University.

John Lukacs has spent a lifetime considering the complex personality and statesmanship of Winston Churchill. In previous books Lukacs has told the story of Churchill's titanic struggle with Adolf Hitler in the early days of World War II. Now, in Churchill: Visionary. Statesman. Historian., he turns his attention to Churchill the man and visionary statesman. Each chapter of this book provides an essential portrait of Churchill. Lukacs treats Churchill's vital relationships with Stalin, Roosevelt, and Eisenhower, as well as his complex, farsighted political vision concerning the coming of World War II and the Cold War. Lukacs also assesses Churchill's abilities as a historian looking backward into the origins of the conflicts of which he was so much a part. In addition, the author examines the often contradictory ways Churchill has been perceived by critics and admirers alike.

The last chapter is a powerful and deeply moving evocation of the three days Lukacs spent in London attending Churchill's funeral in 1965. In Churchill: Visionary. Statesman. Historian., Lukacs deftly sets forth the essence of this towering figure of twentieth-century history with the consummate mastery of a great historian.