Fundraising Fox

Mark Feldner

Founder

Founder at Crimson

London, England, United Kingdom

FoundedCrimson · YC

About

Mark Feldner worked as a litigator at a major law firm before founding Crimson, which builds AI tools for litigation workflows.

LinkedIn ↗

Founder at CrimsonYC X25

Intro paths

YC

Mark went through Y Combinator (Spring 2025) — any YC alum in your network can reach them through the YC community.

GP

Their group partner at YC was David Lieb, General Partner at Y Combinator — the partner who ran Crimson's batch and knows the company first-hand. YC profile ↗

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In turn, Mark can intro founders to Crimson's investors below.

Crimson's investors · 2

Twenty Two VenturesY Combinator

Co-founders at Crimson

DSDavid Strömbäck
David StrömbäckFounder

Experience

  1. CrimsonCo-Foundercurrent2025 — present
  2. Willkie Farr & Gallagher LLPAssociate (Dispute Resolution)2021 — 2023Greater London, England, United Kingdom
  3. WilmerHaleAssociate (Dispute Resolution)2021Greater London, England, United Kingdom
  4. Clifford ChanceAssociate (Dispute Resolution)2019 — 2021London Area, United Kingdom
  5. Clifford ChanceTrainee Solicitor2017 — 2019London, United Kingdom
  6. Cato InstitutePublic Policy Intern2016Washington DC-Baltimore Area

Education

  1. University of CambridgeBachelor’s Degree, Law2012 — 2015
  2. The London School of Economics and Political Science (LSE)Master’s Degree, Political Theory2015 — 2016
  3. BPP Law SchoolLegal Practice Course, Law2017

Founder mafias

Y Combinator mafia8,668

Also came through, then founded or led a company.

Sam AltmanPresidentFounded LooptFred EhrsamYC Summer 2012Founded CoinbaseMatt HuangYC Winter 2011Founded HotspotsTrae StephensYC Winter 2022Founded PursuitDelian AsparouhovYC Summer 2014Founded Nightingale +1Justin KanYC Winter 2018Founded Rye +3

+ 8,661 more

University of Cambridge mafia156

Also came through, then founded or led a company.

Immad AkhundMaster of Arts (M.A.)Founded Heyzap +2Leonard Picardo1st class MEngFounded HeliosX +1Alexander BlessingBachelor of Arts - BAFounded VoiceGem +1Sasha OrloffSemester Abroad (Pembroke College)Founded Lendup +1Harish AgarwalMaster of Philosophy - MPhilFounded Nori +1Tom SayerMAFounded Ello +1

+ 149 more

The London School of Economics and Political Science (LSE) mafia88

Also came through, then founded or led a company.

James J BesharaDevelopment Economics and International DevelopmentFounded Tilt +1Kyle MichelsonGovernment & GlobalizationFounded Getlabs +1Vicente ZavarceOtherFounded Yummy +1Tommy StadlenMSc (Distinction)Founded MeadowMin TeoInternational Human Rights Law and Practice Certificate CourseFounded Ethereal VenturesRobert StoeckerMaster of Science (MSc)Founded Forto

+ 81 more

BPP Law School mafia3

Also came through, then founded or led a company.

Keji MustaphaBar Vocational CourseFounded Connect VenturesStefan VukcevicGraduate Diploma in LawFounded VoxOps AI

Same school

Also attended University of Cambridge793

Niko BonatsosInvestment Team at General CatalystGeorgia StevensonInvestor at Index VenturesHannah SealInvestor at Index VenturesAnthony PhilippakisInvestor at GV (Google Ventures)Erik NordlanderInvestor at GV (Google Ventures)Nic LowdenInvestor at Moonfire Ventures

+ 787 more

Also attended The London School of Economics and Political Science (LSE)933

Lee FixelFounder of AdditionPat GradyPartner at Sequoia CapitalNeil MehtaCo-founder & Managing Partner at GreenoaksCyriac ParisotInvestor at Index VenturesSofia DolfeInvestor at Index VenturesJonas VetterleInvestor at Moonfire Ventures

+ 927 more

Also attended BPP Law School43

Joseph StolermanInvestor at Index VenturesChen Yang SiaGeneral Counsel at Golden Gate VenturesGiles Johnstone-ScottInvestor at MedicxiTony LaiInvestor at StartXKieran RafterPrincipal at Marlin Equity PartnersKeji MustaphaChief Marketing Officer at Partech Ventures

+ 37 more

Shared employers

Also worked at Crimson1

David StrömbäckFounder at Crimson

Also worked at Willkie Farr & Gallagher LLP7

Jack LevyInvestor at Israel Cleantech VenturesAmanda NiuGeneral Partner and CFO at Shine CapitalJan Claudio MuñozPartner at Backbone VenturesAndrew EndicottFounding Partner at Gilgamesh VenturesLeila KhazanehLawyer at Amadeus Capital SATatiana NourissatInvestor at IDI Group

+ 1 more

Also worked at WilmerHale14

André DuboisInvestor at Index VenturesJohn DemeterInvestor at Khosla VenturesBrian GordonManaging Director at Service Provider CapitalCiaran RooneyInvestor at FELIX CAPITALJohn CrandonGeneral Counsel at Thundermark CapitalAdele FrankelInvestor at Maccabee Ventures

+ 8 more

Also worked at Clifford Chance32

Jeroen PlinkVenture Partner at LegalTechLarryPartner and General Counsel at GVP ClimateZi-Yang LimHead of Legal at Jungle VenturesJosé GuardoInvestment & Product Intern at Kibo VenturesVirginia TanFounding & Managing Partner at Teja VenturesSayuri GanesarajahHead of Legal and Compliance at Hivemind Capital Partners

+ 26 more