Elaine Zelby
InvestorVenture Partner at SignalFire · Board director at TestBox
Stanford, California
Writes $5M – $20M checks · typically $12.5M
About
Elaine Zelby is co-founder and Chief Revenue Officer at Tofu, an agentic demand generation platform for B2B marketing teams. Previously, she worked as an early-stage investor at SignalFire and held go-to-market and marketing leadership roles at early and growth-stage startups. Zelby publishes a weekly newsletter called 3 Things and hosts the (un)sexy podcast.
Contact· self-published, not guessed
Likely email· guessed from name + firm domain, not firm-published
- e•••@signalfire.comreveal100% confident
Board director at TestBox
Intro paths
→
In turn, Elaine can intro founders to TestBox's investors below.
TestBox's investors · 3
Co-founders at TestBox
PH
Peter HollandDirector
SS
Samuel SeniorExecutive Officer, Director
Experience
- TofuCo-Founder and CROcurrent2023 — presentSan Francisco Bay Area
- SignalFireVenture Partnercurrent2023 — presentSan Francisco Bay Area
- SignalFirePartner2020 — 2023San Francisco Bay Area
- SignalFirePrincipal & Director of Growth2018 — 2020San Francisco Bay Area
- SVEN (Silicon Valley Executive Network)Board Of Directorscurrent2019 — presentSan Francisco Bay Area
- Product Marketing MastersCo-Foundercurrent2018 — presentSan Francisco Bay Area
- ConsenSysGrowth and Product Marketing Lead2017 — 2018San Francisco Bay Area
- SlackEnterprise Product Marketing Lead2017San Francisco Bay Area
- CaprizaDirector Product Marketing2016 — 2017San Francisco Bay Area
- CaprizaSr. Marketing Manager2014 — 2016Palo Alto, CA
- CaprizaProduct Marketing Manager2012 — 2014SF Bay Area
- Zazzle, IncProduct Manager - Associates Channel2010 — 2012
- Stanford University Oral Presentation of Research AwardAward Winner2006 — 2007
- Stanford UniversityResearch Assistant - Stanford Nanobiotechnology Laboratory2006 — 2007Stanford University
Skills & more
Management10Public Speaking1User Experience18Product Management35Omniture3E-commerce38Product Design3Analytics13Product Development7Web Analytics6Online Advertising5User Experience Design1
+12 more
PhotoshopRapid PrototypingUsability TestingGraphic DesignProject ManagementHTMLUser Interface DesignEmail MarketingSEOSEMSalesforce.comEnterprise SoftwareFrom Elaine's professional profile.
Deals · 1
TestBoxBoard seat
via SignalFire · filed Oct 2025 · $11.4M raise
Attribution from SEC filings, press coverage, and firm rosters.
Colleagues at SignalFire
Aayush Sharma
Senior Associate at SignalFire
Alex Hooshmand
Co-founder ZaiNar & Bluekai at SignalFire
Andrew Reid
Director, GTM Recruiting at SignalFire
Asher Bantock
Head of Research at SignalFire
Audrey Salomez
Contrôleur financier at 123Venture
Ben Davenport
Venture Partner at Blockchain Capital
Bobby Lent
Managing Partner at Hillsven & Co-founder of Ariba at SignalFire
Cali Tran
CEO of Cision; CEO of Brandwatch at SignalFire
Network6
Bradford Jones
Principal at SignalFire
Chris Farmer
Partner & CEO at SignalFire
Chris Scoggins
Partner at SignalFire
Elias Davis
Partner at Kli Capital
Ellen Blix
Partner & Head of Investor Relations at SignalFire
Ilya Kirnos
Partner & CTO at SignalFire
Investors connected to Elaine in public investor directories — a warm-intro map.
Frequently asked questions
- Who is Elaine Zelby?
- Elaine Zelby is co-founder and Chief Revenue Officer at Tofu, an agentic demand generation platform for B2B marketing teams. Previously, she worked as an early-stage investor at SignalFire and held go-to-market and marketing leadership roles at early and growth-stage startups. Zelby publishes a weekly newsletter called 3 Things and hosts the (un)sexy podcast.
- Where does Elaine Zelby work?
- Elaine Zelby is Venture Partner at SignalFire and Board director at TestBox.
- What check size does Elaine Zelby write?
- Elaine Zelby typically writes checks of $5M – $20M.
- What boards does Elaine Zelby sit on?
- Elaine Zelby holds tracked board seats at TestBox.
- Where did Elaine Zelby go to school?
- Elaine Zelby studied at Stanford University (M.S, Mechanical Engineering); Stanford University (B.S., Biomechanical Engineering).
Founder mafias
Stanford University mafia903
Also came through, then founded or led a company.
Peter ThielJ.D.Founded PayPal +1Reid HoffmanB.S.Founded LinkedIn +2Joe LonsdaleBSFounded Opto +3Mike Maples JrBSFounded Pattern BreakersSteve JurvetsonMSEEFounded Mojo VisionBalaji SrinivasanGraduate StudentFounded Counsyl +1
+ 896 more
ConsenSys mafia21
Also came through, then founded or led a company.
Joseph LubinCEO and Founder at ConsenSysFounded Ethereal Ventures +1Nikhil GuptaSoftware EngineerFounded Superpowered +1Min TeoPartner, Venture InvestmentsFounded Ethereal VenturesAndrew HongTechnical Business AnalystFounded Herd LabsJerome de TycheyBlockchain tech lead - Key account managerFounded ComethPraneeth SrikantiInvestment Principal, Consensys VenturesFounded Ethereal Ventures
+ 14 more
SignalFire mafia7
Also came through, then founded or led a company.
Brian NoguchiEntrepreneur in ResidenceFounded Smartcuts +1Lauren (Luna) Ray VegterAssociateFounded Thermeleon +1RossVenture PartnerFounded MuleSoftTony HuiePartnerFounded TwingateJonathan DowneyEntrepreneur In ResidenceFounded AirwareCharu SharmaInvestor / Entrepreneur-in-ResidenceFounded Fenrock AI
Same school
Also attended Stanford University2,000
Peter ThielCo-founder & Partner at Founders FundReid HoffmanCo-founder of LinkedIn; Partner at GreylockDavid SacksCo-founder & General Partner at Craft Ventures; former White House AI & Crypto CzarKeith RaboisManaging Director at Khosla VenturesGarry TanPresident & CEO of Y CombinatorAlfred LinPartner at Sequoia Capital
+ 1,994 more
Shared employers
Also worked at SignalFire37
RossInvestor at Dig Ventures Management LimitedTom RyanInvestor at FELIX CAPITALSooah ChoFormer Underscore Principal at Underscore VCAndrew ReidDirector, GTM Recruiting at SignalFireAsher BantockHead of Research at SignalFireChris FarmerPartner & CEO at SignalFire
+ 31 more
Also worked at Slack55
Mamoon HamidPartner at Kleiner PerkinsHans TungManaging Partner at Notable CapitalStewart ButterfieldCo-founder of Slack and FlickrCal HendersonCo-founder & CTO of SlackDave MunichielloInvestor at GV (Google Ventures)Neha JewalikarDirector of Communications at Scale Venture Partners
.avif)
+ 49 more
