In 1953, Syracuse University Press published his Master’s Thesis under the title The Price of Freedom, Greece in World Affairs 1939-1953. It was the first time in its history that Syracuse University Press published a Master’s Thesis. The book was reviewed in the N.Y.Times Book Review by historian Hans Kohn. The Greek edition of this book was presented by Academician N. Amandos to the Academy of Athens in 1954.
His second book, Key to Economic Progress was published by Ballantine Books in 1958 and then over the next twenty years it was translated and published in 27 languages.
In 1965, Oxford University Press published Revolution and Defeat; The Story of the Greek Communist Party, with an introduction by Christopher Woodhouse, the legendary commander of the Allied Mission to occupied Greece. The book was reviewed in (London) Times Literary Supplement by Reginald Leeper, the British Ambassador to the Greek Government in exile during the Second World War. (During the war years, Kousoulas was scheduled for execution on Monday, January 15, 1945 but the execution was postponed when the British commander Lt.Gen. R.M. Scobie signed with the Greek Communist leaders a truce that came into effect at midnight of January 14 to 15).
In 1961 Professor Kousoulas joined the faculty of Howard University in Washington, D.C. and served as Chairman of the Department of Political Science between 1966-1970 during the turbulent years of student unrest. His textbook On Government and Politics was published in five editions between 1968 and 1981 by Wadsworth.
During the decade of the 1970s he taught also as a Visiting Professor at the National War College (now National Defense University) and was a Guest Lecturer at The George Washington University, the San Diego University, Columbia University, the University of Wisconsin-Madison, the University of Virginia, the University of Athens, Greece, and delivered papers at the annual conventions of The American Academy of Political and Social Science, the Political Science Association, and the American Historical Association. He also contributed articles to numerous publications including the Sunday Star, The Washington Post, Orbis, The Annals of Naval Proceedings, Parade, Balkan Studies, Spoudae, Politka Themata, Kathimerini et als.
In 1974, Scribner’s published his Modern Greece; Profile of a Nation, covering the history of the 150 years since the Greek War of Independence.
In 1983, Brooks-Cole published his Power and Influence: Introduction to International Relations.
After 1983, as Professor Emeritus, he devoted his time to the study of the ancient sources related to the origins of Christianity and to the books of the New Testament in their original Greek language. The first product of this research was his book The Life and Times of Constantine the Great: The First Christian Emperor published in 1996. Constantine had embraced the Christian religion and in so doing he changed the course of history. But Constantine had placed under his imperial mantle a religion that already existed. The question Kousoulas decided to explore next was “How did this religion emerge in the first place?” For the next twelve years, Kousoulas engaged in an exhaustive search to find the answer to this question. The product of this toil was, in 2009, The Birth of Christianity: Was It Jesus or Paul? The Real Story.
For the past six years professor Kousoulas has been contributing a bi-weekly column on current affairs for The National Herald.
Professor Kousoulas has been awarded the Golden Cross of the Order of Phoenix by the Government of Greece. the Medal for Exceptional Actions for his participation in the Resistance during Greece's occupation by the Nazi's, and has been named Archon Deputatos of the Ecumenical Patriarchate in Constantinople.