Professor Dr. Mesut Hakkı Caşın was born in İzmir in 1956 and completed his primary, secondary, and high school education there. In 1983, he graduated with a Bachelor of Laws degree from the Faculty of Law at Istanbul University, followed by a Master of Public Law degree from Gazi University in 1986. He then continued his academic studies in the USA at Texas San Antonio College, specializing in American constitutional law, and received his doctorate in 1994 from the Faculty of Political Science at Istanbul University with a dissertation on "International Security Strategies and Disarmament."
Alongside his academic career, Professor Caşın held important positions in the military and strategic sphere and served at various Turkish Air Force bases. In 1988, he completed training at Texas Lackland, Colorado Lowry, Dallas Sheppard, and Miami Homestead Air Force Bases as part of the US Air Force's F-16 fighter jet project. In 1999, he served as an advisor on international treaties in the Planning and Policy Department of the General Staff of the Republic of Turkey and retired that same year.
Caşın, who was appointed associate professor in 2002 with his work "Russian Imperial Strategy," was promoted to full professor in 2008 due to his research on international terrorism. The first volume of his publication series, entitled "Current Developments in International Law and Defense Policy," appeared in 2026.
Caşın was Vice President of the Center for Strategic Studies at Yeditepe University, a member of the editorial boards of the journals "Perception," "Geopolitics," and "MSI," and has written foreign policy articles for various newspapers and magazines. He is a member of the International Law and Space Law section of the American Bar Association, the US Bar Association, the Istanbul Bar Association, and the TÜDAV (Turkish Association of Lawyers for International Relations).
Throughout his academic career, he taught international law and international relations at the undergraduate, graduate, and doctoral levels at Gazi University, Sabancı University, Yeditepe University, Özyeğin University, İstinye University, the Air Force Academy, and the National Defense University. He was also a member of the Presidential Security and Foreign Policy Council.
His main areas of study and research include international law, energy law, EU law, information law, international security strategies, NATO, Russian foreign policy, international terrorism, cybersecurity and military history.
He is married and has three children.