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 · 18
9Yards CapitalNew York · $100K – $10M checks · since 2025Alchemist AcceleratorSan Francisco · $30K checksAnorak VenturesLos Angeles · $25K – $400K 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 FranciscoPROOFArlingtonSalesforce VenturesSan Francisco · $5M – $50M checks · since 2026Sapphire VenturesMenlo Park · $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
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Co-founders at Onebrief
RP
Rafa PereiraFounder
Experience
- OnebriefCEO and co-foundercurrent2019 — presentAustin, TX
- Alchemist AcceleratorMentorcurrent2020 — presentSan Francisco Bay Area
- Alchemist AcceleratorPortfolio Companycurrent2019 — presentSan Francisco Bay Area
- Y CombinatorS21 Portfolio Company2021San Francisco Bay Area
- US ArmyTransitioning Military Officer2017 — 2018Ft Campbell, KY
- Combined Joint Task Force - Operation Inherent ResolvePartner Force Development Officer2016 — 2017Baghdad, Iraq
- 101st Airborne DivisionExecutive Officer2015 — 2016Ft Campbell, KY
- 101st Airborne DivisionAssistant Operations Officer2015Ft Campbell, KY
- Joint Task Force - United AssistanceAssistant Operations Officer2014 — 2015Monrovia, Liberia
- 2nd BCT, 101st Airborne DivisionBattalion Communications Officer2014Ft Campbell, KY
- Sandhurst CompetitionTeam Captain2012 — 2013West Point, NY
- Defense Threat Reduction AgencyIntern2011Wright-Patterson AFB, Ohio
- Boy Scouts of AmericaEagle Scout2009
Skills & more
Decision theory9Business strategy7Enterprise software9
From Grant's professional profile.
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.
- Where did Grant Demaree go to school?
- Grant Demaree studied at United States Military Academy at West Point (Bachelor's Degree, International Relations); United States Military Academy at West Point (Bachelor's Degree, Nuclear Engineering); River Hill High School.
Founder mafias
Y Combinator mafia8,773
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Sam AltmanPresidentFounded Tools for Humanity +3Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianYC Summer 2005Founded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded Pursuit +1
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Alchemist Accelerator mafia16
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Andrew ScheuermannCoach and InvestorFounded Arch Systems +1Paolo PriviteraMentor at Alchemist AcceleratorFounded 1521 Capital +1Daniel ShaposhnikovMentorFounded HypointAdam FranklPartner ♦ Top 1% CEO Coach ♦ Faculty Member ♦ DevOps ChairFounded AlchemistRavi BelaniFounder & ChairmanFounded AlchemistIan BergmanChief Executive OfficerFounded Alchemist
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+ 9 more
United States Military Academy at West Point mafia16
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+ 9 more
Alchemist mafia10
Also came through, then founded or led a company.
Andrew ScheuermannCoach and InvestorFounded Arch Systems +1Daniel ShaposhnikovMentorFounded HypointJordan KretchmerStrategic AdvisorFounded Carbon RoboticsTomasz GolinskiStartup MentorFounded Cofounder VCStephen SeymourPartnerFounded StepWiseWilliam SchneidermanStartup MentorFounded AI Squared
+ 3 more
River Hill High School mafia2
Also came through, then founded or led a company.
Same school
Also attended United States Military Academy at West Point81
A.J. BertoneExecutive Vice President, Investments at In-Q-TelLes CraigInvestor at Next Frontier CapitalRichard ClarkeInvestor at IVP (Institutional Venture Partners)Aaron StachelPartner at FirstMile VenturesPatrick HenshawManaging Director at Render CapitalBen FawEntrepreneur-in-Residence at Context Ventures
+ 75 more
Also attended River Hill High School3
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Shared employers
Also worked at Onebrief7
Paul KwanInvestment Team at General CatalystLewis CraparottaLieutenant General USMC (ret.) at NEW VISTA CAPITALMichael BrownGeneral Partner at Battery VenturesRichard WellsManaging Director at Insight PartnersFaizan J. KhanFounder and CIO at Visary CapitalRaymond TonsingPartner at Caffeinated Capital
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+ 1 more
Also worked at Y Combinator344
Garry TanPresident & CEO of Y CombinatorJessica LivingstonCo-founder of Y CombinatorDaniel GrossMeta Superintelligence Labs; co-founder of NFDG and Safe SuperintelligenceAlexis OhanianFounder & General Partner of Seven Seven SixMichael SeibelPartner Emeritus at Y CombinatorDalton CaldwellCo-founder of Standard Capital; Partner Emeritus at Y Combinator
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Also worked at US Army134
A.J. BertoneExecutive Vice President, Investments at In-Q-TelJesse RobbinsFounder and Investor in AI Developer ToolsAndrew ForysiakOwner, AJF and Associates at Riphean InvestmentsAaron StachelPartner at FirstMile VenturesBen FawEntrepreneur-in-Residence at Context VenturesCamden SnowdenAssociate at Context Ventures
+ 128 more
