David Brinkley

  • Managing Director
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David brings twenty-five years of experience executing over $3bn in strategic transactions for middle market firms in the aerospace, defense, government, and security sectors.  His security expertise comprises both offensive and defensive cyber operations supporting leading public and private sector organizations.  

David is widely recognized for his industry expertise, which encompasses intelligence and national security activities and applied advanced technologies.  In addition, David holds unique security credentials that enable him to advise on the most sensitive government transactions. David also serves as a subject matter expert to the Office of the Secretary of Defense on matters pertaining to the financial health of the US defense industrial base and on Pentagon-sponsored technology investments.

Prior to joining Capstone Headwaters, David founded Castellum Capital Advisors, a boutique investment bank providing advisory services to middle market firms engaged in the national security sector. Castellum Capital served as exclusive financial advisor on several high profile transactions, including large scale corporate divestitures and niche intelligence acquisitions. Prior to founding Castellum Capital, David served as Managing Director of Aronson Capital Partners, where he managed the firm’s buy and sell-side investment banking engagements. While at Aronson Capital, David completed transactions featuring prominent government services and technology firms active in international security, intelligence, and defense, with publicly-traded firms based both in the US and internationally, and with leading private equity sponsors. 

David also serves as a Director of NextStep Fitness, a California-based non-profit organization dedicated to the rehabilitation and wellness of individuals living with paralysis.


Columbia University - MBA - Finance

Georgetown University's School of Foreign Service - BS - International Relations

Registrations & Affiliations

FINRA - Series 63 Registered Uniform Securities Agent

FINRA - Series 79 Registered Investment Banking Representative

Industry Coverage

Increasingly expansive IoT (internet of things) applications and rapid migration to cloud-based platforms has necessitated heightened focus on robust and cost-effective cybersecurity solutions.  Global cybercrime is expected to inflict approximately $6 trillion in damage in 2021, according to Cybersecurity Ventures, placing critical importance on innovative network security capabilities including real-time threat intelligence, advanced endpoint protection, and security automation to safeguard assets and data.Read more

The performance of publicly traded T&M companies since the onset of COVID-19, shows that while the sector initially suffered a dramatic correction along with the rest of the Technology sector, it has led a recovery into positive territory and showed resilience since mid-June.  We expect this strength to continue for the remainder of the year, placing the sector in an enviable position to benefit from a return to sustainable economic growth in 2021. Read more

The substantial shift to remote working and heightened migration to cloud-based applications has underscored the need for robust and effective cybersecurity solutions.  As the attack surface expands, organizations have faced the task of securing sensitive data and communication outside of their on-premise enterprises due to COVID-19.  Read more