Captain Devinney is a native of Warrington, Pennsylvania. He graduated from the United States Naval Academy in 1990 with a Bachelors of Science Degree in Physics/Oceanography.

CAPT Devinney's initial sea tour was in USS PRINCETON (CG 59), where he served as 1st Lieutenant and then Fire Control Officer from 1991-1994, responsible for the missile and radar systems. He served his Department Head tour in USS VICKSBURG (CG 69) from 1996-1999 as Weapons Officer and Combat Systems Officer. In 2003, CAPT Devinney served as Executive Officer in USS VELLA GULF (CG 72). From 2008-2010, he commanded USS COLE (DDG 67). On COLE, he deployed to the Arabian Gulf and Somali Basin conducting counter piracy and counter terrorism operations in support of OPERATION OCEAN SHIELD.

Ashore, CAPT Devinney served in the Pentagon from 1999-2002, as the SMART SHIP and DDG Modernization Resource Sponsor for the Director, Surface Warfare (N86). In 2003, he reported to the Director, Navy Missile Defense (OPNAV N71), serving as Combat Systems Interoperability and Joint Distributed Engineering Plant (JDEP) Resource Sponsor. From 2004-2007, CAPT Devinney served as the Secretary of the Navy's Surface Warfare's Congressional Liaison to the Senate and House Appropriation Committees. From 2010-2011, CAPT Devinney served as the Joint Urgent Operational Needs (JUONS) and Rapid Fielding Branch Head on the Joint Staff (J8). From 2012-2013, he served as Senate Director for the Office of Secretary of Defense, Legislative Affairs. In 2013, CAPT Devinney was the Maritime Warfare Branch Head for the Navy's Quadrennial Defense Review and subsequently served as Strategy Branch Head for the Director, Surface Warfare (OPNAV N96). In 2014, CAPT Devinney became the Director, Strategic Cyber Defense for the Office of Secretary of Defense, Cyber Policy, in the Pentagon. In August 2016, he was appointed Director, Corporate Partnerships and Technology Outreach for United States Cyber Command in Fort Meade, Maryland. In this position, he is responsible for U.S. Cyber Command's strategic partnerships with commercial industry, Military Services, Academia and Federal Science and Technology Research Labs.

Captain Devinney is a 1995 graduate of the Naval Postgraduate School where he earned a Masters of Management in Financial Management, and was designated a Conrad Scholar for academic excellence in Financial Management. Additionally, Captain Devinney is a 2008 graduate of the Industrial College of the Armed Forces, earning a Masters Degree in National Resource Strategy, specifically focused on the financial sector.