Exceptional Employees For Exceptional Results

Our Vision

E3R is a Service Disabled Veteran Owned Small Business (SDVOSB) founded in 2011 to provide engineering and program management services to the Department of Defense (DoD) and Department of Homeland Security (DHS).

Our Mission

Our company name reflects our business model. We achieve our purpose and business success through hiring and retaining the very best employees in our industry.  E3R employees hold trusted positions providing engineering and programmatic support to government maritime C5ISR programs.

Mark Tierney graduated from the US Naval Academy in 1977 with a B.S. in Operations Analysis. He was the Arleigh Burke Honor Graduate and the Combat Systems Honor Graduate of his Basic Surface Warfare Officer class.

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Mark Tierney


Dennis Walsh received his Commission as a Naval Officer in 1988 upon graduating from the United Stated Naval Academy with a B.S. in Physical Science. He went on to graduate from Naval Post Graduate School in 1996 with a M.I.S. in Information Technology Management (ITM). As a Naval Aviator his tours included: Deputy Commodore, Chief Staff Officer, Helicopter Strike Maritime Wing, San Diego, CA; Executive Officer, Helicopter Strike Maritime Four One, San Diego, CA; SH-60B Maintenance Officer, Detachment Officer in Charge, Helicopter Squadron Light Four Five, San Diego, CA; SH-60B Training Officer, Helicopter Squadron Light Four One, San Diego, CA; SH-60B Quality Assurance Officer, Helicopter Squadron Light Four Three, San Diego, CA; SH-60B Aircraft Division Officer, Helicopter Squadron Light Four Seven, San Diego, CA ; Flight Student, Naval Flight Training, Pensacola, FL and San Diego, CA. T-34C, TH-57B/C, SH-60B; and Director, President’s Emergency Operations Center, White House Military Office, Washington, D.C. where he developed, implemented and maintained vital and highly sensitive Presidential, Vice-Presidential, National and White House contingency command, control and communication plans involving multi-billion dollar federal, military and civilian assets. After retiring from the Navy in 2007, he went on to serve at SRA International, Inc. as Principal, Director of Operations, San Diego, Program Manager PMW 160 Tactical Networks; Program Manager Joint Tactical Radio System, Network Enterprise Domain (JTRS-NED); SRA Program Manager PMW 150 Tactical C2. He then went on to serve Operations Director Information Warfare San Diego. as the Program/Portfolio Manager SPAWAR Market for Engility Corporation where he provided direct and engaged oversight on seven Prime contracts in support of SPAWAR, PEO C4I, SSC Pacific, SSC Atlantic, and PEO Subs PMS 485 with combined annual revenues exceeding $34M. Mr. Walsh joined E3R as Program/Portfolio Manager SPAWAR Market, providing strategic level leadership, management, mentoring, and oversight of E3R contracts. He provides technical guidance across program management disciplines and engineering services focused in Naval C4ISR, and also has had extensive experience in support of Continuous Process Improvement (CPI) given his extensive studies in Total Quality Leader (TQL) while attending Naval Postgraduate School (NPS), as well as the leadership and support he provided on multiple CPI and Lean Six Sigma (LSS) events while serving as the Prime Contractor’s PM in support of the Professional Support Services (PSS) contracts in SPAWAR/PEO C4I PMW. Dennis has received numerous personal awards including Defense Meritorious Achievement Medal and Meritorious Achievement Medal. Also serves on the Board of Directors for the San Marcos Chamber of Commerce.

Dennis Walsh

SPAWAR Portfolio Manager

Gary Brister enlisted in the United States Navy in 1982 going on to receive his Commission as a Naval Officer in 1987 upon graduating from the University of Oklahoma with a B.A. (dual degree) in Economics and Political Science.  He went on to graduate from Naval Post Graduate School in 1993 with a M.S. in Information Technology Management (ITM).  As a Surface Warfare Officer his tours in the Navy included: USS NEW ORLEANS (LPH 11); USS LA SALLE (AGF 3); USS TARAWA (LHA 1); Speech Writer within the Public Affairs Office (PAO), Commander Naval Surface Forces Pacific (CNSP); Office in Charge of Landing Craft Utility (LCU) Department, Assault Craft Unit ONE, in charge of 14 LCUs located in San Diego CA and Sasebo Japan; Assistant Functional Integration Manager, Navy Center for Information Technology (CIT) supporting implementation of the Navy’s “Revolution in Training;” Strategic Planning, Combined Forces Command Afghanistan / CJ5 Strategy Planner and Policy Branch Kabul, Afghanistan developing weekly Presidential (POTUS) and bi-weekly Secretary of Defense (SECDEF) briefings; and Director, Officer Professional Development Program, Navy Center for Information Dominance (CID West).  After retiring from the Navy in 2006, he went on to serve in the capacity of a Business Development and Capture Lead for Ocean Systems Engineering (OSEC), QinetiQ North America (QNA) through the acquisition of OSEC, Barling Bay, TASC, and then ENGILITY through acquisition and merger with TASC.  Leaving ENGILITY, Gary became Growth Lead at E3R in 2017. In pursuit of challenging and highly competitive procurements, his win-rates are above the industry average for both new and incumbent work, and he has successfully broken into new markets across DoD.  He also continues to actively support the San Diego Chapter of the Armed Forces Communications Electronics Association (AFCEA) and has served numerous years on the AFCEA San Diego Executive Committee and as the Executive Vice President AFCEA San Diego.  Gary received numerous awards including the Defense Meritorious Service Medal and the Bronze Star Medal.

Gary Brister

Growth Lead

Lorraine Banner is the Business Manager for E3R. She possesses 25 plus years of experience in operations and financial management.  This expertise is demonstrated in client relations, financial management, recruiting, project management and complex life cycle management support programs aspects of E3Rs operations. Lorraine’s other trusted responsibilities are the management of E3R’s benefit plans, reporting requirements and managing all audits.
Lorraine discovered her natural interests in high school where she enjoyed working with numbers and solving problems.  Her first job was working at a senior services center that provided lunches and networking to retired seniors.  Each subsequent job, new opportunities were selected that would increase her knowledge and continue to develop new skills. While attending college her accounting professor strongly encouraged her to pursue financial accounting positions.  This advice was taken to heart and with each new opportunity she continued to gain depth and expertise in financial matters.  To this day, her philosophy is simple and has served her well “If you work, find your happy place–be passionate and enjoy what you do”.
Lorraine’s career started as a paraprofessional for CPA firm.  Progressing forward, she became a staff accountant for a construction company and was then promoted up to Controller.   Continuing through her career, she worked for several large corporations carrying out and implementing change that propelled these companies to continued financial success.  Prior to E3R, Lorraine worked for QinetiQ North America where she was responsible for the financial management of a division consisting of a large group of government contracts within QNA’s Systems Engineering and Technical Assistance Group.
In her spare time, Lorraine enjoys photography and volunteer work for the United States Marine Corps (USMC) where she serves as an administrator of family support groups.  Lorraine travels to and attends every School of Infantry graduation donating her photography skills to take pictures for families that cannot attend.  As a Colorado native, you can expect to see her cheering on the Denver Broncos.

Lorraine Banner

Business Manager

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For Exceptional Results