Chronis is an Academy Stavros Niarchos Foundation Fellow at the International Security Department, Chatham House. Before joining Chatham House Chronis was an officer at the Hellenic Navy. He is also a visiting research fellow at the Dartmouth Centre for Seapower and Strategy at Plymouth University.

He has over 15 years of professional experience as a navy warfare officer in NATO, EU and UN operations. His research interests include cybersecurity, defence studies, international and maritime security.

He has published widely for Foreign Affairs, Chatham House, International Affairs, the Academy for Strategic Analyses, has been interviewed by The New York Times, the Independent and The Wall Street Journal and has participated in several maritime and cybersecurity related conferences and forums. Chronis currently leads a research project at Chatham House on Maritime Cybersecurity Awareness.

He holds a BSc in Naval Warfare from the Hellenic Naval Academy, an MA in International Relations and Global Security from Plymouth University and a PGCert in Defence Management and Leadership from the Hellenic Naval War College.