John Castles

Colonel (USA Retired), Chief Operating Officer

John Castles is an experienced business executive with over nine years of strategic development and corporate management experience and over 23 years of active duty leadership in the Department of Defense (DoD). He coordinates all aspects of Markez’s corporate operations, ensuring efficient management of the company’s portfolio.

He previously served as an Executive Vice President and member of the Executive Management Team (EMT) for A-T Solutions Inc., providing business unit leadership and oversight for over 60 programs and 500 employees supporting DoD as well as other Federal, State, and Local organizations both in the United States and internationally.

Castles’ military experience includes seven combat deployments to Iraq and Afghanistan, and leadership positions including Commander of the 2nd Brigade Combat Team, 82nd Airborne Division; Commander of the 3rd Battalion, 75th Ranger Regiment; and, Commander of the 3rd Battalion, 325th Airborne Infantry Regiment, 82d Airborne Division.

Castles holds a bachelor’s degree in Finance from the University of Virginia, a Masters in History from the University of Alabama, and is a certified Project Management Professional (PMP).



Key Experience

Chief Operating Officer & Executive Management Team Member, Markez Inc., and Victor 12 Inc.
EVP Defense Group & Executive Management Team Member A-T Solutions
SVP, Intelligence Division, A-T Solutions
Commander, U.S. Army, Multiple Organizations

Skill Set

Executive Leadership
Strategic Development
Corporate Management
Operational Efficiency