Maria Proestou

Maria Proestou is the President and Chief Executive Officer of DELTA, which she co-founded in 2000. In addition to guiding the company’s growth and development, Proestou oversees quality control and serves as an expert on the Navy’s strategic planning, budgeting, and program management. She is one of only a few financial contractors qualified to work alongside the Lean/ Six Sigma experts to implement the NAVSEA Lean/Six Sigma practices. Proestou is a frequent speaker on issues related to defense contracting and the workplace.



Kevin Mills

Kevin Mills is the Chief Financial Officer and a senior engineer at DELTA, which he co-founded in 2000. Mills has more than 25 years of combat weapon systems experience. He began his career in the defense industry and directed the development of a combat system test and evaluation facility in the United Kingdom. He provided direct support of Cooperative Engagement Capability (CEC) implementation in the JFK, NIMITZ, and REAGAN Strike Forces. Currently, Mills ensures that DELTA remains competitive and profitable.

Tom Winckler

Tom Winckler joined DELTA as the Chief Operating Officer in 2001. He successfully implements the company’s strategies, overseeing human, financial, technological, informational, and material resources. He also is responsible for ensuring that DELTA has the optimal organizational structure and appropriate systems of incentives. Winckler has a background in Navy combat system design, development, and acquisition, which he acquired as a surface warfare officer and engineering duty officer in the United States Navy. He served for 16 years on active duty followed by eight years in the Reserves.

Keegan Mills

Keegan Mills, DELTA’s Chief Information Officer, is responsible for ensuring that the company’s information technology investments are aligned with strategic business objectives. He also oversees DELTA’s internal information technology program and coordinates IT capabilities to ensure compliance with contract statements of work that enhance DELTA’s ability to serve customer needs. Mills has been integral in the development of DELTA’s management information systems since the early days of the company and has the distinction of being the first employee hired by DELTA after the three founders.

Chris Bahret

Chris Bahret joined DELTA as Vice President, Customer Solutions, in 2013. He has more than 25 years of executive level experience in business development, management, and engineering in the federal business sector. Bahret manages DELTA’s new business identification and pursuit activities, directing strategic planning and solution development. Bahret has worked in the federal services market, providing program and engineering management for U.S. Navy AEGIS and Amphibious Ship Acquisition programs. Bahret began his career as an engineer with Bethlehem Steel Corporation, Marine Division.

Steve Hughes

Steve Hughes has over 30 years of experience providing senior-level engineering services, program management, and configuration management. He is the Director of DELTA’s Joint Integrated Warfare Systems Engineering Team. Hughes previously held management and combat system engineering positions in support of the Joint Program Executive Office for Integrated Air and Missile Defense (JPEO IAMD), the Single Integrated Air Picture Systems Engineering Task Force (SIAP SE TF), the Assistant Secretary of the Navy (Research, Development and Acquisition) Chief Engineer (ASN (RDA) CHENG), and the AEGIS program office supporting the C4I domain.

Shawn Tallant

Shawn Tallant, joined DELTA as Vice President for Joint Solutions in 2017. He brings more than 40 years of senior leadership experience spanning military and industry strategy development, program management and acquisition. Tallant is Director of the Joint Solutions Group responsible for contract execution as well as sector future growth. Prior to joining DELTA, Tallant was Vice President for Business Development at Gibbs & Cox, Inc., and a Business Executive for Raytheon IDS. Before joining the Defense Industry, Tallant served 27 years as a career Navy officer where he had command of both aviation and surface commands, retiring with the rank of Captain.