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Grant Demaree

InvestorUnicorn founder

Founder at Onebrief

San Francisco Bay Area

FoundedOnebrief$2.1B · YC

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About

Grant Demaree is a West Point graduate with degrees in Nuclear Engineering and International Relations who served five years as an Army officer, including deployments supporting counter-epidemic and counterterrorism operations, before co-founding Onebrief.

Founder at OnebriefYC S21

Intro paths

YC

Grant went through Y Combinator (Summer 2021) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was Brad Flora, Backing expeditions into the future — the partner who ran Onebrief's batch and knows the company first-hand. YC profile ↗

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In turn, Grant can intro founders to Onebrief's investors below.

Onebrief's investors · 23

9Yards CapitalNew York · $100K – $10M checks · since 2025Alchemist AcceleratorSan Francisco · $30K checksAnorak VenturesLos Angeles · $25K – $400K checksArden Road VenturesAwesome People Ventures$50K – $250K checksBattery VenturesBoston · $500K – $100M checks · since 2026Caffeinated CapitalSan Francisco · $3M – $50M checks · since 2026General CatalystSan Francisco · $30M checks · since 2024Human CapitalSan Francisco · $250K – $200M checks · since 2025Insight PartnersNew York · $120M – $350M checks · since 2026Kyber Knight CapitalSan FranciscoLynett Capital PartnersJupiterMana VenturesEsteroOurCrowdJerusalemPROOFArlingtonSalesforce VenturesSan Francisco · $5M – $50M checks · since 2026Sapphire VenturesAustin · $5M – $20M checks · since 2026Signia Venture PartnersMenlo Park · $500K – $2M checksSummit Peak InvestmentsFort WorthU.S. Air Forcesince 2019U.S. Navysince 2023Visary CapitalSyossetY CombinatorSan Francisco · $500K checks · since 2021

Co-founders at Onebrief

RPRafa Pereira
Rafa PereiraFounder
RP
Rafael PereiraFounder

Investments

Investor

Usul

Per curated public sources.

Frequently asked questions

Who is Grant Demaree?
Grant Demaree is a West Point graduate with degrees in Nuclear Engineering and International Relations who served five years as an Army officer, including deployments supporting counter-epidemic and counterterrorism operations, before co-founding Onebrief.
Where does Grant Demaree work?
Grant Demaree is Founder of Onebrief.
What companies did Grant Demaree found?
Grant Demaree founded Onebrief.
What companies has Grant Demaree invested in?
Investments tracked here include Usul.

Founder mafias

River Hill High School mafia3

Also came through, then founded or led a company.

Shivum PandoveHigh School DiplomaFounded Kairos +1Jason GuoFounded Erinys

About this profile. Compiled from public sources — Onebrief's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights