Brian O'kelley
Co-Founder And CEO at Scope3
New York, New York, United States
Summary
🤩
Rockstar🎓
Top SchoolBrian O'Kelley is a veteran technology founder and CEO who has repeatedly built category-defining platforms for advertising and supply-chain transparency, most recently co-founding Scope3 to decarbonize media and advertising as a public benefit company. He led AppNexus from a 2007 apartment startup to a $1.6B exit and invented foundational programmatic ad technologies—ad exchanges, DSPs/SSPs, and header bidding—holding 17 patents. Equally hands-on, he authored key parts of the open-source Prebid Server used for real-time auctions and contributed integrations like Facebook Audience Network and mobile endpoints. Brian combines product vision, deep systems engineering, and operational leadership across startups and large integrations (Right Media, Waybridge), and he brings a consistent focus on mission-driven businesses and measurable impact. Based in New York, he balances technical authorship with board-level strategy and long-standing support for STEM and global development causes.
9 years of coding experience
20 years of employment as a software developer
BSE Computer Science, BSE Computer Science at Princeton University
Stackoverflow
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Github Skills (12)
apim10
openrtb10
go10
api10
api-design10
restful-api9
rest-api9
api-rest9
json9
testing8
dockers7
docker7
Programming languages (4)
Github contributions (5)
prebid/prebid-server
Apr 2017 - Jul 2017
Open-source solution for running real-time advertising auctions in the cloud.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 19 commits, 54 PRs in 2 months
Contributions summary:Brian's commits primarily focused on the development of the Prebid Server's core functionalities related to real-time advertising auctions. The user implemented and integrated support for various advertising platforms, specifically including Facebook's Audience Network, and enhanced the Rubicon adapter to handle multiple ad sizes. Furthermore, the user added new endpoints for mobile app support, and also added a cookie sync feature. Throughout the commits, the user made several code improvements.
nodejsserver-sideprebid
bokelley/salesagent
May 2026 - Jun 2026
A media sales agent that implements the AdCP Media Buy protocol
Contributions:46 PRs, 321 pushes, 199 branches in 1 month
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