Fundraising Fox

Alexander Urbanski

Founder

Co-Founder at Ultrasonium

Greater Boston

FoundedUltrasonium · YC

Find your path to Alexander

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

Sam BlackmanunlockedAlexander: together at University of Illinois Chicago
×8Alexander: together at University of Illinois Chicago
×2Alexander: together at Argonne National Laboratory
Alexander: together at College of DuPage

About

Co-founder and Chief Research Officer of Ultrasonium, a materials science and advanced manufacturing company. He previously founded the DOE-funded nuclear startup Bay State Energy, invented the Nuclear Thermoelectric Generator, studied physics at Boston University, and was the first hire at Phase3D, where he developed and commercialized metals manufacturing technology.

Co-Founder at UltrasoniumYC S26

Intro paths

YC

Alexander went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.

GP

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

→

In turn, Alexander can intro founders to Ultrasonium's investors below.

Ultrasonium's investors · 1

Y CombinatorSan Francisco · $500K checks · since 2026

Co-founders at Ultrasonium

JQJack Qiu
Jack QiuFounder
HBHunter Brown
Hunter BrownFounder
CCChris Carter
Chris CarterFounder

Experience

  1. UltrasoniumCo-Foundercurrent2026 — presentBoston, Massachusetts, United States
  2. Bay State EnergyCo-Founder2023 — 2025Boston, Massachusetts, United States
  3. ReHomeSoftware Engineer2024Cambridge, Massachusetts, United States
  4. Caribbean Science FoundationElectronics & Calculus Teaching Assistant2023Barbados
  5. Argonne National LaboratoryR&D Engineer2022Lemont, Illinois, United States
  6. Phase3DR&D Engineer2022
  7. DARIEN STUDY CENTER INCCompetitive Robotics Coach2021 — 2022Darien, Illinois, United States
  8. DARIEN STUDY CENTER INCQuantitative Researcher2020 — 2021Darien, Illinois, United States
  9. RoguePro2017 — 2020

Skills & more

Experimental PhysicsNuclear PhysicsBusinessProject ManagementManufacturing EngineeringMechanical EngineeringElectrical EngineeringEconomicsGame TheorySystems EngineeringRoboticsMachine Learning
+8 moreApplied Mathematics3D ModelingPhysicsFull-Stack DevelopmentNuclearEnergyTeachingEngineering

Languages Arabic · English · Spanish

From Alexander's professional profile.

Frequently asked questions

Who is Alexander Urbanski?
Co-founder and Chief Research Officer of Ultrasonium, a materials science and advanced manufacturing company. He previously founded the DOE-funded nuclear startup Bay State Energy, invented the Nuclear Thermoelectric Generator, studied physics at Boston University, and was the first hire at Phase3D, where he developed and commercialized metals manufacturing technology.
Where does Alexander Urbanski work?
Alexander Urbanski is Co-Founder of Ultrasonium.
What companies did Alexander Urbanski found?
Alexander Urbanski founded Ultrasonium.
Where did Alexander Urbanski go to school?
Alexander Urbanski studied at Boston University (Bachelor's degree, Physics); College of DuPage (Associate of Science - AS, Aerospace); University of Illinois Chicago (Master of Science - MS, Mechanical Engineering).

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

Boston University mafia187

Also came through, then founded or led a company.

Arjun SethiBA (WIP)Founded Termina +4Oleg RogynskyyBachelor's DegreeFounded UFORCE Acquired +2Ben ZisesFounded Superangelsyndicate +2Sanjiv SanghaviBAFounded Texture +2Dave KerpenBS and BAFounded Likeable Local +2Brandon PatonBAFounded Glider +2

+ 180 more

University of Illinois Chicago mafia47

Also came through, then founded or led a company.

Chris LiMaster's degreeFounded Oak +1Mohamed GeneadMedical Retina Fellowship | Ophthalmologist | Retina SpecialistFounded Aviceda Therapeutics +1Ben AlbertMBAFounded Upfront Healthcare +1Adam KhanBSFounded Diamondquanta +1Sam BlackmanPhDFounded Day One BiopharmaceuticalsAnshul SadanaMSFounded Nexthop

+ 40 more

College of DuPage mafia2

Also came through, then founded or led a company.

Jeff O'HaraComputer ScienceFounded Edmodo

Same school

Also attended Boston University554

Aydin SenkutFounder & Managing Partner at FelicisVinnie LauriaFounding Partner at Golden Gate VenturesJeff GrammerPartner at Rho VenturesGil GorenPartner at 83NorthJames LindenbaumCo-founder at HeavybitDave BiscegliaVenture Partner at Founder Collective

+ 548 more

Also attended College of DuPage9

Diana NarváezPrincipal at Flourish VenturesAnnika FarkasMBA Associate at Duke Capital PartnersSabrina DeStefanoPhD Associate at Duke Capital PartnersJeff O'HaraCo-Founder at EdmodoJoshua ShubertChief Technology Officer at Avenda HealthPatrick KoellerCTO at When

+ 3 more

Also attended University of Illinois Chicago118

Sam BlackmanEntrepreneur in Residence at GV (Google Ventures)Kate WilschutzChief Financial Officer, Revolution Funds at RevolutionSteve ShafferOperating Partner at Volition CapitalAnshul SadanaCEO, Nexthop AI at EMERGENT VENTURESStefano GaliassoVice President at Energy Capital VenturesBoris GyllhamnInvestment Manager at Almi Invest GreenTech

+ 112 more

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 VenturesCollin WallaceGeneral Partner at Lobby CapitalVictor SantosVictor Scout at One Way Ventures

+ 1,994 more

Shared employers

Also worked at Ultrasonium2

Jack QiuFounder at UltrasoniumHunter BrownFounder at Ultrasonium

Also worked at Argonne National Laboratory50

Aparna KrishnanVenture Partner at Verge HealthTech FundKatherine HeSenior Investment Associate at TDK VenturesGus DomelPartner at Boost VCJack StockertManaging Director at Health2047Wenyi CaiManaging Partner & CEO at Polymath VenturesDr. Jay WalshVice President for Economic Development and Innovation, University of Illinois at Illinois Ventures

+ 44 more

Also worked at Rogue2

Frank VillarrealExecutive Officer, Director at Rogue SportsCarson KnuthExecutive Officer, Director at Rogue Sports