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Jeff Weinstein

Jeff Weinstein

Partner at FJ Labs, investing in marketplaces, crypto, and Web3

New York, New York, United States
Joined August 2025

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Summary

Jeff Weinstein is a seasoned venture capital investor, currently serving as a Partner at FJ Labs, where he co-leads the investment team and manages external fundraising. He specializes in online marketplace startups, network effect businesses, and has expanded his investment focus to include crypto and Web3. fjlabs+2
His career trajectory includes a strong foundation in finance, starting at a fund of hedge funds and then as an Associate at Lux Capital, a prominent deep tech venture firm. This diverse experience has equipped him with a broad understanding of both traditional and cutting-edge investment landscapes. substack
Beyond his investment roles, Jeff actively contributes to the startup ecosystem through board positions, having served as a Board Director for Rive and ViajaNet, and a Board Observer for Mundi and Properly. He is also a Fellow of Class 24 at Kauffman Fellows and a member of the Milken Institute's Young Leaders Circle, indicating his commitment to professional development and leadership within the venture community. kauffmanfellows+2
Academically, Jeff holds a Bachelor of Arts in Philosophy, Politics, and Economics from the University of Pennsylvania, demonstrating a multidisciplinary approach to his education. He also maintains a notable athletic pursuit as a competitive distance runner, achieving impressive personal bests in the mile and marathon. kauffmanfellows+1

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A competitive distance runner with personal bests of 4:05 in the mile and 2:30 in the marathon. kauffmanfellows

Notes

SSSameer Singhsaid they've seen
JWJeff Weinstein
add meaningful value to the companies they invest in.

Nov 11, 2025

NLNathan Leesaid they would reach out to
JWJeff Weinstein
for advice or investment if they were building a new B2C company.

Oct 29, 2025

SSSameer Singhsaid
JWJeff Weinstein
has a track record of spotting and backing great early-stage companies as a venture investor.

Sep 2, 2025