The CSI Process

Critical Solutions International (CSI) is a company made up of exceptional people who have a demonstrable record of transforming challenging problems into thoughtful and affordable engineered solutions. Our expertise working in the Defense, Security, and Applied Research & Development markets allows Critical Solutions International to deliver high-quality solutions to our worldwide clients.

Founded in 1999, CSI provides platforms that detect and mitigate evolving threats for security forces worldwide. When your critical infrastructure is in environments where threats are dynamic and enemies have no border or uniforms, CSI has combat proven solutions that:

  • - Detect and analyze threats
  • - Mitigate threats with multiple platforms
  • - Train and support in-theater personnel to sustain operations and discover future threats
Critical Solutions International
Value Proposition

Based on CSI’s people (experience & contacts) in the Department of Defense, Research & Development and Program Management we posses a combination of skill sets that delivers solutions to our clients most pressing problems.

  • Discover Need
    or Problem
  • Design
    • Current Inventory
    • Research & Development
    • Industry Partners
  • Develop
    • Presenting Solution
    • Extensive Contacts
    • Market SME
  • Deliver Solutions
    • Training
    • Service Support
    • Maintenance & Spares

CSI Overview

CSI Senior Leadership

Patrick Callahan

Chief Executive Officer

Patrick T. Callahan MBA, MA, MS

Patrick Callahan is the Chief Executive Officer of Critical Solution International ( and serves as a member of CSI’s Board of Directors. For three years prior, Patrick served as CSI’s Chief Strategic Officer, responsible for CSI’s strategic growth, business development and research and development operations. Before joining CSI, Patrick was the Director of Business Development for the Survivability Division of QinetiQ North America where he was responsible for managing contracts, proposals and sales totaling over $800 million.

Patrick has over 14 years of documented leadership experience and success in military, educational and business environments. For the past seven years Mr. Callahan has served in several senior management positions in the defense industry and has tremendous success in building business units, driving new business development and providing direction for program management. He has a wealth of experience in leadership, administration and management of personnel, fiscal management, scheduling/planning and problem solving. Mr. Callahan received his B.A. from Cornell University in Ithaca NY, M.A. and M.S. from Simmons College in Boston MA, and his M.B.A. from Babson College in Wellesley MA.

Along with his business experience, Patrick served as an Infantry officer in the United States Army (active and reserve) from 2002 to 2012. From October 2003 until December 2004 Mr. Callahan deployed to Operation Iraqi Freedom with the US Army’s first Stryker Brigade Combat Team and served as a Platoon Leader, Executive Officer, and Company Commander in 1-23 Infantry “Tomahawks”. In addition to his service in Iraq, Patrick led an Escort Platoon and conducted over 300 burial and ceremonial missions in the military district of Washington DC and Arlington National Cemetery as a member of the oldest active Infantry Regiment in the US Army, 1-3 Infantry “The Old Guard”. Mr. Callahan finished his military career after a successful Company Command in the oldest reserve Infantry Battalion in the US Army, 1-181 Infantry.

Patrick is also currently a Visiting Instructor of Leadership at the Citadel’s School of Business Administration. His wife, Kristen, works at the Ashley Hall School in downtown Charleston as the Director of the Intermediate School and Varsity Lacrosse coach. Their daughter, Maisie, is also a student at Ashley Hall. The family enjoys time at the beach, working in the garden, watching the Red Sox, Patriots & Bruins win championships and playing with Riggs, their Chocolate Lab.


  • M.B.A., F.W. Olin Graduate School of Business at Babson College, 2013
  • M.A., Teaching, Simmons College, 2008
  • M.S., Educational Leadership and Administration, Simmons College, 2008
  • B.A., History and Anthropology, Cornell University, 2002

Board of Directors

Andrew Byrd, CEO & President, TVV Capital
Patrick Callahan, CEO, CSI
Steve Cook, Partner, TVV Capital, Advisory Director
Raymond Craig III, CSI
Ed Fearon, Vice Chairman, CSI
Matthew Harrison, Operating Partner, Sentinel Capital Partners
Paul Murphy, Partner, Sentinel Capital Partners
Rick Reisner, Principal, TVV Capital
Marc A. Buan, Vice President, Sentinel Partners
LTG (Ret.) Thomas F. Metz, former Director of the Joint IED Defeat Organization