About
James Thomas is Co-Founder and CEO of Radical, which develops high-altitude solar-powered aircraft. He previously spent six years at Amazon Prime Air working on aerodynamics and aircraft design for delivery drones.
Founder at RadicalYC W23
Intro paths
YC
James went through Y Combinator (Winter 2023) — any YC alum in your network can reach them through the YC community.
GP
Their group partner at YC was Jared Friedman, YC Group Partner — the partner who ran Radical's batch and knows the company first-hand. YC profile ↗
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In turn, James can intro founders to Radical's investors below.
Radical's investors · 8
Bessemer Venture PartnersRedwood City · $5M – $100M checks · since 2026BoxGroupNew York · $1M checks · since 2026ConvictionSan Francisco · $1M – $25M checks · since 2026Inflection.xyzBoston · $500K – $2M checksRadical VenturesToronto · $1M – $25M checks · since 2026Scout VenturesAustin · $2M – $5M checksScout VenturesAustin · $2M – $5M checksY CombinatorSan Francisco · $500K checks · since 2023
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Co-founders at Radical
CN
Cyriel NotteboomFounder
Experience
- RadicalCo-Founder & CEOcurrent2022 — presentSeattle, Washington, United States
- AmazonSr. Research Scientist - Prime Air2021 — 2022Seattle, Washington, United States
- AmazonResearch Scientist II - Prime Air2018 — 2021Seattle, WA
- AmazonResearch Scientist - Prime Air2017 — 2018Seattle, WA
- AmazonFlight Support Engineer - Prime Air2016 — 2017Cambridge, United Kingdom
- Titan Motorsport and Automotive EngineeringProject Engineer2015 — 2016Cambridge, United KIngdom
- University of SouthamptonUAV Research Intern2014Southampton, United Kingdom
Frequently asked questions
- Who is James Thomas?
- James Thomas is Co-Founder and CEO of Radical, which develops high-altitude solar-powered aircraft. He previously spent six years at Amazon Prime Air working on aerodynamics and aircraft design for delivery drones.
- Where does James Thomas work?
- James Thomas is Founder of Radical.
- What companies did James Thomas found?
- James Thomas founded Radical.
- Where did James Thomas go to school?
- James Thomas studied at Y Combinator (W23); University of Southampton (Masters, Aeronautics & Astronautics).
Founder mafias
Y Combinator mafia8,773
Also came through, then founded or led a company.
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
+ 8,766 more
Y Combinator mafia4,716
Also came through, then founded or led a company.
Ryan SheaEntrepreneurshipFounded StacksTarek MansourFounded KalshiSuhail DoshiEating beans & riceFounded Playground +1Subomi OluwalanaW22Founded ConvoyDarius "Bubs" MonsefS19Founded Sightbox +3Matthew ScholzFounded Oisin Biotechnologies +3
+ 4,709 more
University of Southampton mafia16
Also came through, then founded or led a company.
Robert BalfourBScFounded Pro MatixAli SaheliMEngFounded TeleSwapAlex FisherBachelor of Science - BSFounded AOA DxBoateng Opoku-YeboahBachelor's degreeFounded FuseOliver LaslettDoctor of Philosophy (PhD)Founded LightdashBotty DimanovComputer ScienceFounded Tenyks
+ 9 more
Same school
Also attended Y Combinator2,000
Tarek MansourCo-founder & CEO of KalshiSuhail DoshiFounder of Mixpanel; founder of ParticleSubomi OluwalanaCo-founder & CEO of ConvoyArhaan A.Deeptech Fellow at Clear VenturesMaroof AhmedFounder at Octopus VenturesCollin WallaceGeneral Partner at Lobby Capital
+ 1,994 more
Also attended University of Southampton111
Adrian RaduInvestor at Khosla VenturesLinda VõerasVenture Partner at Karma VenturesFrancesco MonacaInvestor at Giant Ventures Global LlpSpencer SkinnerManaging Partner at Active PartnersLewis JonesInvestment Principal at Seraphim SpaceDamilola Teidi-AyoolaHead, Platform & Networks at Ventures Platform
+ 105 more
Shared employers
Also worked at Radical2
Also worked at Amazon779
Apoorva MehtaFounder of Instacart; founder of Cloud Health SystemsBinny BansalCo-founder of Flipkart; co-founder of PhonePe and OppDoorBrad PorterFounder & CEO of Collaborative RoboticsJane MooneyCo-founder & VP, Strategy and Finance at Collaborative RoboticsNick FrosstCo-founder of CohereDave MunichielloInvestor at GV (Google Ventures)
+ 773 more
Also worked at University of Southampton14
Damilola Teidi-AyoolaHead, Platform & Networks at Ventures PlatformTony RavenChair of Board and Consultation Committee at UK Innovation & Science Seed FundNeville GrechCo-Founder at DedaubAndrew KimChief Financial Officer at Waterous Energy FundPaulina JakubecManaging Director at Jakubec Family OfficeRahim LakhaniChief Executive Officer at TLG Global
+ 8 more