Where does Seth Rosenberg work?

Seth Rosenberg is Partner at Greylock Partners and Investor (Greylock) at Lightfield and Board Member (Greylock Partner) at Greenlite AI and Board director at Magical.

What check size does Seth Rosenberg write?

Seth Rosenberg typically writes checks of $500K – $200M.

What boards does Seth Rosenberg sit on?

Seth Rosenberg holds tracked board seats at Magical.

What companies has Seth Rosenberg invested in?

Investments tracked here include Tome.

Where did Seth Rosenberg go to school?

Seth Rosenberg studied at Queen's University (Bachelor of Commerce, Commerce); ESSEC Business School (BBA, Finance).

Does Seth Rosenberg lead rounds?

Yes — Seth Rosenberg has led 1 tracked investment.

Seth Rosenberg

Investor

Partner at Greylock Partners · Board Member at Espresso Systems · Investor (Greylock) at Lightfield · Board Member (Greylock Partner) at Greenlite AI · Board director at Magical

New York, New York

Writes $500K – $200M checks · typically $25M

Find your path to Seth

1,159 people in our graph share verified history with Seth — schools, employers, funds. One of them is your warm intro.

Alex TranunlockedSeth: together at Ramp (2023–2026)

×7Seth: together at Goldman Sachs

×2Seth: together at Ramp

×2Seth: together at Facebook

About

Seth Rosenberg is an investor at Greylock Partners who backs founders building AI-first products. He previously worked at Meta, where in 2016 he was involved in an AI bot platform effort on Messenger, including a pilot with KLM airlines. He focuses on AI-first networks and marketplaces, AI-driven enterprise software categories, and AI co-pilots for services.

Contact· self-published, not guessed

s•••@greylock.comreveal

Likely emails· guessed from name + firm domain, not firm-published

Invests in

AI & Machine LearningConsumerCybersecurityEnterprise SoftwareFintechMarketplacesSaaS

Investor (Greylock) at Lightfield

Intro paths

→

In turn, Seth can intro founders to Lightfield's investors below.

Lightfield's investors · 7

Andreessen HorowitzMenlo Park · $500K – $50M checks AudaciousSan Francisco Coatue ManagementNew York · $1M – $20M checks Greylock PartnersSan Francisco · $100K – $200M checks Lightspeed Venture PartnersMenlo Park · $1.7M – $87M checks WingPalo Alto · $200K – $20M checks Worklife VenturesWalnut · $500K – $2M checks

Co-founders at Lightfield

Keith PeirisCEO & Co-Founder

Henri LirianiPresident & Co-Founder

Ves StoyanovFounder

Board Member (Greylock Partner) at Greenlite AI

Intro paths

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In turn, Seth can intro founders to Greenlite AI's investors below.

Greenlite AI's investors · 5

Canvas VenturesCampbell · $5M – $20M checks · since 2026 Greylock PartnersSan Francisco · $100K – $200M checks Sapphire VenturesMenlo Park · $5M – $20M checks · since 2026 Thomson Reuters VenturesNew York · since 2026 Y CombinatorSan Francisco · $500K checks · since 2026

Co-founders at Greenlite AI

Will LawrenceCo-Founder & CEO

Alex JinCo-Founder

Board director at Magical

Intro paths

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In turn, Seth can intro founders to Magical's investors below.

Magical's investors · 10

Alt CapitalSan Francisco · $1M – $10M checks Bain Capital VenturesBoston · $1M – $100M checks Blank VenturesSan Francisco · $500K – $2M checks · since 2022 Coatue ManagementNew York · $1M – $20M checks · since 2022 Dylan Field Greylock PartnersSan Francisco · $100K – $200M checks · since 2021 GTMfundScottsdale · $500K – $1.5M checks Lightspeed Venture PartnersMenlo Park · $1.7M – $87M checks · since 2023 Scott Belsky SV AngelSan Francisco · since 2022

Co-founders at Magical

Harpaul SambhiCEO & Co-Founder

Rosie ChopraCOO & Co-Founder

Prashant VishwanathanEngineering Manager & Cofounder

KEITH PEIRISExecutive Officer, Director, Promoter

HENRI LIRIANIDirector

Prashant ViswanathanEngineering Manager & Co-Founder

Zach PiepmeyerCo-Founder & Head of Design (as of 2022)

Experience

GreylockGeneral Partnercurrent2017 — presentNew York, United States
Bretton AIBoard Membercurrent2023 — presentSan Francisco Bay Area
AsporaInvestorcurrent2024 — present
RampInvestorcurrent2023 — presentNew York, New York, United States
Espresso SystemsBoard Membercurrent2021 — present
LightfieldBoard Membercurrent2020 — present
PineBoard Membercurrent2022 — presentToronto, Ontario, Canada
RobloxBoard Observercurrent2018 — presentRedwood City, California, United States
PayJoyBoard Observercurrent2018 — present
WisetackBoard Observercurrent2018 — present
FacebookProduct Manager2013 — 2016san francisco bay area
Goldman SachsInvestment Banking, Tech, Media & Telecom (TMT)2012 — 2013New York City
Queen's University Investment CounselChief Strategy Officer (CSO)2011 — 2012
William Morris EndeavorAssistant to Talent Agent2010

Skills & more

Public Speaking15Equity Valuation4Financial Analysis11Financial Modeling19Direct Sales2Entrepreneurship43Investment Banking2Valuation6Leadership15Investments9Business Strategy3Business Development5

+4 more

Team LeadershipStart-upsManagementAdvertising

From Seth's professional profile.

Investments

Led

Tome

Board seats

Magical

Sources: the firm's website · SEC Form D filings.

Colleagues at Greylock Partners

Alona King

Fellow at LifeX Ventures

Aneel Bhusri

Partner at Greylock Partners

Ani Narayan

Scout at Greylock Partners

Ankit Mathur

Scout at Greylock Partners

Asheem Chandna

Partner at Greylock focused on enterprise, cybersecurity, and infrastructure software

Bob Henderson

Special Limited Partner at Greylock Partners

Bukky Adebayo

Scout at Greylock Partners

Charlie Waite

Founding Partner at Greylock Partners

Network1

Erica Dorfman

Scout at Greylock Partners

Investors connected to Seth in public investor directories — a warm-intro map.

Frequently asked questions

Who is Seth Rosenberg?: Seth Rosenberg is an investor at Greylock Partners who backs founders building AI-first products. He previously worked at Meta, where in 2016 he was involved in an AI bot platform effort on Messenger, including a pilot with KLM airlines. He focuses on AI-first networks and marketplaces, AI-driven enterprise software categories, and AI co-pilots for services.
Where does Seth Rosenberg work?: Seth Rosenberg is Partner at Greylock Partners and Investor (Greylock) at Lightfield and Board Member (Greylock Partner) at Greenlite AI and Board director at Magical.
What does Seth Rosenberg invest in?: Seth Rosenberg invests in AI & Machine Learning, Consumer, Cybersecurity, Enterprise Software, Fintech, Marketplaces, SaaS.
What check size does Seth Rosenberg write?: Seth Rosenberg typically writes checks of $500K – $200M.
What boards does Seth Rosenberg sit on?: Seth Rosenberg holds tracked board seats at Magical.
What companies has Seth Rosenberg invested in?: Investments tracked here include Tome.
Where did Seth Rosenberg go to school?: Seth Rosenberg studied at Queen's University (Bachelor of Commerce, Commerce); ESSEC Business School (BBA, Finance).
Does Seth Rosenberg lead rounds?: Yes — Seth Rosenberg has led 1 tracked investment.