
John Sillings
Building Manifolds · 3x Founder · 4x Growth · YC Alum · Ex-Wall St
jsmanifolds
New York, United States
Joined October 2025
Network
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Summary
John Sillings is a serial entrepreneur with a strong focus on growth strategies for technology startups. He has founded three companies, Manifolds, Mini Exhibitions, and Art in Res, the latter two being successfully acquired or transitioned. His experience spans biotech, devtools, and art marketplaces, demonstrating versatility in applying growth principles across diverse industries. johnsillings+2
He possesses a solid foundation in finance and economics, with a BA in Economics from NYU where he was a Presidential Honors Scholar and Phi Beta Kappa. His early career included roles as an Equity Analyst at Karani Asset Management and LAGODA INVESTMENT MANAGEMENT, LP, and Portfolio Management Analyst roles at U.S. Trust, reflecting an analytical and data-driven approach to business. rocketreach+2
John is a Y Combinator alumnus, having completed the 'Making Something People Want' program. This experience, combined with his frequent reflections on startup culture, growth, and AI on his personal blog and social media, highlights his continuous engagement with the startup ecosystem and commitment to innovative problem-solving. johnsillings+3
Beyond his entrepreneurial endeavors, John has contributed to academic and popular writings, notably collaborating with author Mitchell Stephens on several books related to journalism and societal topics. This demonstrates his intellectual curiosity and ability to engage with complex ideas outside of his core business pursuits. johnsillings+3
Work
Education
Writing
Thoughts on using a computer efficiently
September 1, 2025Thoughts on how to disagree
September 1, 2025How far away is a fully AI-run business?
April 1, 2024Terms of Service (Art in Res)
July 1, 2020Authored the terms of service for the Art in Res platform.
What is a Studio Visit?
November 1, 2019A guide to meeting artists where they work, published on the Art in Res blog.
Beyond News: The Future of Journalism
Contributed important ideas and facts to this book by Mitchell Stephens.
Don't Trust Your Gut: Using Data to Get What You Really Want
Acknowledged for contributions to this book by Seth Stephens-Davidowitz.
Imagine There's No Heaven: How Atheism Helped Create the Modern World
Acknowledged by Mitchell Stephens for expanding his thinking on various matters.
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