Company Overview

E3/Sentinel, a NewSpring Holdings company, is a mission-focused services and solutions company headquartered in McLean, VA. Since E3 Federal Solutions and The Sentinel Company combined forces in 2018, E3/Sentinel works as a combined entity to draw upon their long histories of consistent growth and high performance in the federal services market. The company’s services and solutions are designed, tailored, and executed based on the experience both organizations bring from helping their Homeland Security, Defense, Intelligence, and Federal Civilian customers solve complex problems.

Our team of dedicated colleagues allow us to provide a wide range of skills and expertise along with unmatched delivery excellence while maintaining an innovative and entrepreneurial culture that is laser-focused on positive customer outcomes. The services and solutions we provide include: Program Management; Strategic Communications; Policy Analysis; Stakeholder Management; Acquisition Management; Systems Engineering and Technical Assistance; Facilities and Engineering Support; and Enterprise IT Service Management Solutions.

About NewSpring Holdings

NewSpring Holdings, the dedicated, diversified holding company within NewSpring, with a strategy focused on control buyouts and platform builds, brings a wealth of knowledge, experience, and resources to take profitable, growing companies to the next level through acquisitions and proven organic methodologies. Founded in 1999, NewSpring partners with the innovators, makers, and operators of high-performing companies in dynamic industries to catalyze new growth and seize compelling opportunities. The Firm manages approximately $1.8 billion across four distinct strategies covering the spectrum from growth equity and control buyouts to mezzanine debt. Partnering with management teams to help develop their businesses into market leaders, NewSpring identifies opportunities and builds relationships using its network of industry leaders and influencers across a wide array of operational areas and industries. Visit NewSpring at

About Sentinel

Helping achieve positive national security outcomes is in The Sentinel Company’s DNA. Founded in 2006, Sentinel provides its national security customers a broad range of mission and advisory services as well as technology-enabled solutions to help achieve mission-focused results. Sentinel personnel are recognized experts in subjects including intelligence, counterterrorism, counter-narcotics, border security, and international trade and travel. Sentinel’s industry expertise, leadership experience, and familiarity with government agencies and how they operate allow it to make recommendations that can be successfully implemented in the public sector. The Sentinel team’s expertise and mission focus have allowed them to achieve real wins for their customers, making Sentinel a trusted name in national security..

Enterprise-Level Quality Credentials

Our quality organization provides Excellence in Execution through its independent quality assurance organization, customer satisfaction survey oversight, tailored execution approach, standard program management and service methodologies, and monthly performance reviews. Our credentials include: 
  • Excellence in Quality Management: ISO 9001:2015 (Held since 2015; Upgraded in 2018)
  • Excellence in Environmental Management: ISO 14001:2015 (Certified in 2018)
  • Excellence in Providing Services: CMMI® Services (Version 1.3) Maturity Level 3 (Held since 2016, Expires 2020)
Company Summary
Avantus Federal
Number of Employees
(571) 551-2731
8281 Greensboro Drive
McLean, VA