# Seth Rosenberg

> Seth Rosenberg is a General Partner at Greylock Partners, where he leads investments in fintech and AI from the firm's New York office. Before venture capital, he spent three years at Facebook as a product manager on Messenger - helping scale it from 200 million to over one billion monthly active users and launching its AI bot platform. Before that, he worked in tech and media investment banking at Goldman Sachs. At Greylock, he has championed an influential 'Product-Led AI' investing framework and backed companies including Ramp, Tome (now Lightfield), Wisetack, PayJoy, and Roblox.

- **Role:** General Partner at Greylock Partners
- **Organizations:** Greylock Partners, Ramp, Wisetack, PayJoy, Tome (Lightfield), Roblox, Pine, 0x Labs, Greenlite, Espresso Systems, Bretton AI, Aspora
- **From:** Winnipeg, Canada
- **Nationality:** Canadian-American
- **Education:** Bachelor of Commerce, Queen's University, BBA, ESSEC Business School
- **Known for:** Helped scale Facebook Messenger from 200 million to over 1 billion monthly active users in two years, Launched Facebook Messenger's AI bot platform and developer integrations with Uber, Lyft, KLM, Led Greylock's investment in Ramp (now a multi-billion dollar company)

## Career timeline

- **2011-2014** — Investment Banking Analyst/Associate at Goldman Sachs, New York - tech & media focus; worked on RetailMeNot IPO, Intelsat, AT&T financings, Tekelec sale to Oracle
- **2014-2017** — Product Manager at Facebook, San Francisco - led Messenger Developer Platform; helped spin off Messenger as standalone app; launched AI bot platform; scaled from 200M to 1B+ monthly active users
- **2017-present** — General Partner at Greylock Partners - leads fintech and AI investments from New York office; developed 'Product-Led AI' framework

## Achievements

- Helped scale Facebook Messenger from 200 million to over 1 billion monthly active users in two years
- Launched Facebook Messenger's AI bot platform and developer integrations with Uber, Lyft, KLM
- Led Greylock's investment in Ramp (now a multi-billion dollar company)
- Led seed round in Tome (Lightfield) - platform reached 10M+ users within 9 months of launch
- Established Greylock's New York investment office
- Developed the 'Product-Led AI' investing framework widely cited in venture circles
- Board Director at PayJoy, Wisetack, Tome/Lightfield since 2018-2021
- Former board member at Roblox

## Latest updates

- **2025-09** — Featured in Greylock YouTube Shorts about fintech and AI investing potential
- **2024-05** — Discussed Lightfield (formerly Tome) AI-native CRM pivot and board involvement
- **2023-07** — Profiled in Fortune magazine outlining his '80/20 AI investing strategy'
- **2023-06** — Published 'Product-Led AI' essay on Greylock's Greymatter blog
- **2023-05** — Debated Sam Lessin on Turpentine VC Podcast: 'Will AI Favor Incumbents or Startups?'

## Links

- Website: https://greylock.com/team/seth-rosenberg/
- LinkedIn: https://www.linkedin.com/in/sethgrosenberg
- Twitter/X: https://x.com/SethGRosenberg
- YouTube: https://www.youtube.com/@sethrgs55
- Facebook: https://www.facebook.com/sethgrosenberg

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Profile page: https://yespress.io/seth-rosenberg
Published by YesPress — https://yespress.io
Last updated: 2026-05-08