Find your path to Mark
616 people in our graph share verified history with Mark — schools, employers, funds. One of them is your warm intro.
Sridhar RamaswamyunlockedMark: together at University of Cambridge (2013–2015)
×2Mark: together at University of Cambridge
×5Mark: together at The London School of Economics and Political Science (LSE)
Mark: together at WilmerHale
About
Mark Feldner worked as a litigator at a major law firm before founding Crimson, which builds AI tools for litigation workflows.
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 · 5
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Co-founders at Crimson
DS
David StrömbäckFounder
Experience
- CrimsonCo-Foundercurrent2025 — present
- Willkie Farr & Gallagher LLPAssociate (Dispute Resolution)2021 — 2023Greater London, England, United Kingdom
- WilmerHaleAssociate (Dispute Resolution)2021Greater London, England, United Kingdom
- Clifford ChanceAssociate (Dispute Resolution)2019 — 2021London Area, United Kingdom
- Clifford ChanceTrainee Solicitor2017 — 2019London, United Kingdom
- Cato InstitutePublic Policy Intern2016Washington DC-Baltimore Area
Frequently asked questions
- Who is Mark Feldner?
- Mark Feldner worked as a litigator at a major law firm before founding Crimson, which builds AI tools for litigation workflows.
- Where does Mark Feldner work?
- Mark Feldner is Founder of Crimson.
- What companies did Mark Feldner found?
- Mark Feldner founded Crimson.
- Where did Mark Feldner go to school?
- Mark Feldner studied at University of Cambridge (Bachelor’s Degree, Law); The London School of Economics and Political Science (LSE) (Master’s Degree, Political Theory); BPP Law School (Legal Practice Course, Law).
Founder mafias
Y Combinator mafia10,230
Also came through, then founded or led a company.
Sam AltmanPresidentFounded Tools for Humanity +3Garry TanPresident & CEOFounded Y Combinator +1Jessica LivingstonCo-founderFounded Y CombinatorAlexis OhanianPartnerFounded RedditFred EhrsamYC Summer 2012Founded Nudge +1Matt HuangYC Winter 2011Founded Paradigm +1
+ 10,223 more
University of Cambridge mafia589
Also came through, then founded or led a company.
Stewart ButterfieldMPhilFounded Flickr +1Demis HassabisBAFounded Google Deepmind +2C. Giovanni TraversoMBFounded Teal Bio +4Immad AkhundMaster of Arts (M.A.)Founded Mercury Technologies, Inc. +3Inaki BerenguerMasterFounded InfiniteWatch +2Harish AgarwalMaster of Philosophy - MPhilFounded Nori +2
+ 582 more
The London School of Economics and Political Science (LSE) mafia340
Also came through, then founded or led a company.
Anne OsdoitCorporate Finance & Strategy - Executive summer schoolFounded Moon Surgical +2Henson OrserGeneral CourseFounded Soter +2Logan J HendersonSummer CertificateFounded Gridline Holdings +2Toby TriebelBsCFounded Spotcap +1Shaoib MakaniBScFounded Motive Technologies +1Steve LoughlinCertificateFounded RelateIQ +1
+ 333 more
BPP Law School mafia14
Also came through, then founded or led a company.
Anastasios PapadopoulosGraduate Diploma in Law - London CampusFounded IMS Group +1Keji MustaphaBar Vocational CourseFounded Connect VenturesJulia ZenniGraduate Diploma in LawFounded SmiletronixLou ArzurGraduate Diploma in LawFounded SmiletronixStefan VukcevicGraduate Diploma in LawFounded VoxOps AIGus NeateMaster of Laws - LLMFounded ClarenAI
+ 7 more
Same school
Also attended University of Cambridge1,604
Stewart ButterfieldCo-founder of Slack and FlickrDemis HassabisCo-founder & CEO of Google DeepMindNiko BonatsosFounder and Managing Partner of VerdictGeorgia StevensonInvestor at Index VenturesHannah SealInvestor at Index VenturesLeah von SiemensPartner at Manta Ray Ventures
+ 1,598 more
Also attended The London School of Economics and Political Science (LSE)1,646
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
+ 1,640 more
Shared employers
Also worked at Crimson1
Also worked at Willkie Farr & Gallagher LLP22
Jack LevyInvestor at Israel Cleantech VenturesAmanda NiuGeneral Partner and CFO at Shine CapitalJan Claudio MuñozPartner at Backbone VenturesBrandon MhangamiAssociate at Augmentum FintechAndrew EndicottFounding Partner at Gilgamesh VenturesEiichiro HaraSenior Managing Director, Business Development, Japan at Capital Dynamics
+ 16 more
Also worked at WilmerHale34
André DuboisInvestor at Index VenturesJohn DemeterInvestor at Khosla VenturesBrian GordonManaging Director at Service Provider CapitalCiaran RooneyInvestor at FELIX CAPITALSteve GiordanoGeneral Counsel at Casdin CapitalBecca CooperSenior Corporate Counsel at Omidyar Network
+ 28 more
Also worked at Clifford Chance65
Jeroen PlinkVenture Partner at LegalTechStephen SwansonChief Legal Officer at Valor Equity PartnersZi-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
+ 59 more