Admiral Estioko is the President of the National Defense College of the Philippines (NDCP). Born on 9 November 1954, Admiral Estioko graduated as a member of the Philippine Military Academy (PMA) “Masikap” Class of 1977. Furthering his education, Admiral Estioko holds a Master in Management (Philippine Christian University, Manila, 1994), Master in National Security Administration (NDCP, Quezon City, 2004), and Doctor of Philosophy in Development Education (Central Luzon State University, Science City of Munoz, Nueva Ecija, 2010).

A man of decisive leadership and compassionate to his officers and staff, Admiral Estioko occupied various command and staff positions in the military. He commanded five (5) naval ships. He likewise served as the Executive Officer of the BRP Ang Pangulo (AT 72), the yacht of the President of the Philippines. He also served as the Chief of Staff, Philippine Fleet; Chief of Naval Intelligence; Commander, Naval Intelligence and Security Force; Commander, Patrol Force; Commander, Naval Forces Central; and The Naval Inspector General.

Admiral Estioko capped his 33-year service in the Armed Forces of the Philippines as the Vice Commander, and briefly as Acting Flag-Officer-in-Command of the Philippine Navy in 2010.

He has also been active in the academe, having been a Senior Fellow for Development and Security and also served as Member of the Council of Professors involved in various Masteral and Executive Doctorate Program of the Graduate School of Public Development and Management at the Development Academy of the Philippines (DAP). Prior to his assumption as President of NDCP, he was elected as the President of the NDCP Alumni Association, Inc.(NDCPAAI) and before that, he was the Executive Vice President of the NDCP Alumni Association, Inc (NDCPAAI), who cemented a strong symbiotic relationship between the alumni association and the college, which jointly conducted local and international conferences particularly on cybersecurity and climate change.

A decorated sailor, Admiral Estioko received the Philippine Legion of Honor (Degree of an Officer), Distinguished Service Star Medal, Bronze Cross Medal, Distinguished Navy Cross Medal, among others. As a scholar, he received various awards for academic excellence in his military schoolings and the NDCP Certificates of Merit for Exemplary Academic Performance. As an alumnus, he received the NDCP Outstanding Alumnus Award, Distinguished Achievement Award and Meritorious Service Award. He also received the Grand Lodge of the Philippines Certificate of Honor for being a Distinguished Mason in Government and a Plaque of Recognition from the Alpha Phi Omega Fraternity.

Admiral Estioko is married to the former Cecilia Santos-Pecache. The couple is blessed with three children, namely: Rocelle, Robert Charles, and Randall.