Where does Arthur Karell work?

Arthur Karell is General Partner at First In and Board director at Any Signal.

What check size does Arthur Karell write?

Arthur Karell typically writes checks of $500K – $2M.

Where did Arthur Karell go to school?

Arthur Karell studied at Harvard University (Bachelor of Arts (B.A.), Political Science and Government); University of Virginia School of Law (Doctor of Law (J.D.), International Law and Legal Studies).

Arthur Karell

Investor

General Partner at First In · Board director at Any Signal

San Diego Metropolitan Area

Writes $500K – $2M checks

Find your path to Arthur

183 people in our graph share verified history with Arthur — schools, employers, funds. One of them is your warm intro.

Trae StephensunlockedArthur: together at Anduril (2019–2022)

×6Arthur: together at United States Marine Corps

×2Arthur: together at Anduril

×2Arthur: together at University of Virginia School of Law

About

Co-author of First In's investment memo on Hybron.

Invests in

AI & Machine LearningCybersecurityData & InfrastructureDeep TechDefense TechHardware

Board director at Any Signal

Intro paths

→

In turn, Arthur can intro founders to Any Signal's investors below.

Any Signal's investors · 8

Acequia Capital (AceCap)Seattle · $100K – $5M checks Balerion Space VenturesDallas Beyond CapitalSan Diego BlueYard CapitalBerlin · $500K – $5M checks First InWashington · $500K – $2M checks Mana VenturesEstero U.S. Air Forcesince 2023 Upfront VenturesLos Angeles · $1M – $10M checks · since 2025

Co-founders at Any Signal

Ricardo MedinaFounder

Ricky MedinaFounder

Experience

First InGPcurrent2022 — present
AnySignalBoard Membercurrent2024 — present
Anduril IndustriesSenior Legal Counsel & Corporate Development2019 — 2022
FiscalNoteVP Corporate Development & General Counsel2013 — 2019Washington D.C.
Special Operations Joint Task Force- AfghanistanSpecial Operations Forces Advisor Team Leader2011 — 2013Afghanistan
United States Marine CorpsInfantry Officer2007 — 2011United States, Japan, Afghanistan
Willkie Farr & Gallagher LLPAssociate2005 — 2007Washington DC

Skills & more

Leadership90Intelligence8Business Development31Entrepreneurship34Start-ups33Policy37Government43Operational Planning49Sales Operations18Leadership Development30Sales22Command17

+12 more

MilitaryNational SecurityProgram ManagementMilitary OperationsTrainingCounterinsurgencyAfghanistanForeign AffairsMilitary ExperienceCorporate LawTechnologyCompliance

Languages Dari · French · Spanish

From Arthur's professional profile.

Colleagues at First In

Brian O'Keefe

Advisor at First In

Brian Schmanske

Advisor, Dual-Use Technology at First In

Claudius E. Watts IV

Senior Advisor at First In

Harish Devarajan

Independent Board Member at Starkware

Ish Boyle

Advisor, Go-to-Market at First In

Jessica Nelson

Principal at First In

Kevin Uebelhardt

Investor at First In

Kristen Stanley

Operations Manager at First In

Frequently asked questions

Who is Arthur Karell?: Co-author of First In's investment memo on Hybron.
Where does Arthur Karell work?: Arthur Karell is General Partner at First In and Board director at Any Signal.
What does Arthur Karell invest in?: Arthur Karell invests in AI & Machine Learning, Cybersecurity, Data & Infrastructure, Deep Tech, Defense Tech, Hardware.
What check size does Arthur Karell write?: Arthur Karell typically writes checks of $500K – $2M.
Where did Arthur Karell go to school?: Arthur Karell studied at Harvard University (Bachelor of Arts (B.A.), Political Science and Government); University of Virginia School of Law (Doctor of Law (J.D.), International Law and Legal Studies).

Same school

Also attended Harvard University2,000

Ron ConwayFounder of SV Angel Alfred LinPartner at Sequoia Capital Chris DixonFounder & Managing Partner of a16z crypto at Andreessen Horowitz Sarah TavelVenture Partner at Benchmark Danny RimerPartner at Index Ventures Laela SturdyManaging Partner at CapitalG

+ 1,994 more

Also attended University of Virginia School of Law45

Rob LudwigChief Operating Officer at Hoxton Ventures Aaron ChandlerGeneral Counsel at Capital Eleven Don BaerSenior Advisor at Audere Capital Jon FlintFounding Partner at Polaris Partners Ryan FrisbiePartner at VIEWPOINT VENTURES Faie DorinGeneral Counsel & Chief Compliance Officer at Cota Capital

+ 39 more

Shared employers

Also worked at AnySignal1

Jai RelanFounder at Relling

Also worked at Anduril Industries43

Trae StephensPartner at Founders Fund and co-founder of Anduril Katherine BoyleGeneral Partner at Andreessen Horowitz (American Dynamism)Palmer LuckeyFounder & CTO of Anduril Industries; founder of Oculus VR Paul KwanInvestment Team at General Catalyst Mark XuInvestor at Index Ventures Michael RobinsonInvestor at Craft Ventures

+ 37 more

Also worked at FiscalNote19

Greg BenanteInvestor, IPD Capital at IPD Capital Akash KalagaraAnalyst, Business Development at Five Elms Capital Lia CromwellPartner at UpWest Mark BlakeStrategy & Corporate Development Leader at Joyance Partners Craig BurelGeneral Partner at Reciprocal Ventures Sheel TyleFounder and CEO at Amplo Ventures

+ 13 more

Also worked at United States Marine Corps57

Douglas Lemott Jr.Vice President, SAP National Security Services at Riphean Investments Tony WellsVenture Partner at Copper Sky Capital William RobertsTreasurer at Maryland TEDCO Beau HigginsVP (OPlign), Senior Client Partner (The Military Veteran) at Context Ventures Mike SteadmanFounder, Coach, USNA '10 — writing, coaching, and designing categories for underdog military veteran founders and CEOs Glenn VogelVenture Partner at IronGate Capital Advisors

+ 51 more