Grant Demaree
Co-founder and CEO of Onebrief, a military operational-planning software company; former US Army officer.
Grant Demaree co-founded Onebrief in 2019 with Rafa Pereira after five years as a U.S. Army officer, including deployments to Liberia during the Ebola response (Joint Task Force United Assistance) and to Iraq in the counter-ISIS campaign. A 2013 West Point graduate with a double major in Nuclear Engineering and International Relations, he leads Onebrief — now used across the largest U.S. and allied military headquarters — through Y Combinator (Summer 2021) and a 2026 Series D at a $2B+ valuation led by Battery Ventures and Sapphire Ventures.
Overview
- Role
- Co-Founder & CEO
- Based in
- Austin, Texas, USA
- Prior experience
Affiliated funds0
No linked records yet.
Frequently asked
- Who is Grant Demaree?
- Grant Demaree co-founded Onebrief in 2019 with Rafa Pereira after five years as a U.S. Army officer, including deployments to Liberia during the Ebola response (Joint Task Force United Assistance) and to Iraq in the counter-ISIS campaign. A 2013 West Point graduate with a double major in Nuclear Engineering and International Relations, he leads Onebrief — now used across the largest U.S. and allied military headquarters — through Y Combinator (Summer 2021) and a 2026 Series D at a $2B+ valuation led by Battery Ventures and Sapphire Ventures.
- What is Grant Demaree's role?
- Grant Demaree is Co-Founder & CEO, based in Austin, Texas, USA.
Sources & citations4
Each claim links to its underlying source. Confidence reflects how directly the source supports the claim.
- 1
Grant Demaree co-founded Onebrief in 2019 with Rafa Pereira; the company went through Y Combinator's Summer 2021 batch
Y Combinator: OnebriefVerified2026-07-20 - 2
Grant Demaree, CEO & Co-Founder of Onebrief; USMA (West Point) class of 2013, double major in Nuclear Engineering and International Relations; five years as a U.S. Army officer with deployments to Liberia (Ebola response) and Iraq (counter-ISIS)
The Montgomery Summit: Grant Demaree — Speaker BioVerified2026-07-20 - 3
Onebrief, the military operational-planning software company co-founded by Grant Demaree, raised a $200M Series D at a $2B+ valuation led by Battery Ventures and Sapphire Ventures
Crunchbase News: Defense Tech Unicorn Onebrief Raises $200M, Acquires Battle RoadVerified2026-01-13 - 4
Independent confirmation of Onebrief's $200M Series D at a $2B+ valuation
Built In: Onebrief Raises $200M Series D, Hits $2B ValuationVerified2026-01-13