Fundraising Fox
Brian O'Kelley
InvestorFounderAdvisor at BlackSheep Ventures · Founder at Appnexus · Founder at Scope3
Brooklyn, New York
Writes $5K – $50K checks · typically $25K
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About
Brian O'Kelley is the co-founder and CEO of Scope3, a company building infrastructure for agentic advertising, and the architect of the Ad Context Protocol. He previously co-founded and led AppNexus through its $1.6B sale to AT&T in 2018, served as CTO of Right Media through its $850M acquisition by Yahoo in 2007, co-founded Waybridge, and sat on the board of LiveRamp; he holds 17 patents and was the original author of the open source Prebid Server project. O'Kelley holds a B.S.E. in Computer Science from Princeton University and lives in Brooklyn.
Founder at Appnexus
Intro paths
In turn, Brian can intro founders to Appnexus's investors below.
Appnexus's investors · 5
Co-founders at Appnexus
Founder at Scope3
Intro paths
In turn, Brian can intro founders to Scope3's investors below.
Colleagues at BlackSheep Ventures
Network7
Investors connected to Brian in public investor directories — a warm-intro map.
Frequently asked questions
- Who is Brian O'Kelley?
- Brian O'Kelley is the co-founder and CEO of Scope3, a company building infrastructure for agentic advertising, and the architect of the Ad Context Protocol. He previously co-founded and led AppNexus through its $1.6B sale to AT&T in 2018, served as CTO of Right Media through its $850M acquisition by Yahoo in 2007, co-founded Waybridge, and sat on the board of LiveRamp; he holds 17 patents and was the original author of the open source Prebid Server project. O'Kelley holds a B.S.E. in Computer Science from Princeton University and lives in Brooklyn.
- Where does Brian O'Kelley work?
- Brian O'Kelley is Founder of Appnexus and Advisor at BlackSheep Ventures and Founder at Scope3.
- What check size does Brian O'Kelley write?
- Brian O'Kelley typically writes checks of $5K – $50K.
- What companies did Brian O'Kelley found?
- Brian O'Kelley founded Appnexus, Scope3.
Founder mafias
Appnexus mafia9
Also came through, then founded or led a company.
BlackSheep Ventures mafia5
Also came through, then founded or led a company.
About this profile. Compiled from public sources — BlackSheep Ventures's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights