KB Ken G. Brook III

Ken G. Brook III • Tech Founder • Entrepreneur

A founder career shaped by company creation, category timing, and commercial execution.

Building trust-first platforms across adtech, blockchain, and agentic AI.

Ken Brook builds in markets where technology shifts faster than the tools teams rely on. His work turns emerging change into products people can adopt, buy, and grow with.

Over the last decade, he has founded six ventures spanning digital advertising, blockchain-based systems, and AI-powered marketing products.

LinkedIn Crunchbase
6 companies founded Boise, Idaho Adtech, AI, blockchain

Founder Throughline

Across each chapter, the pattern is similar: find the bottleneck, build the missing layer, and turn it into something the market can use.

Featured In

Coverage across business, advertising, and technology publications.

Forbes Business
WSJ National press
Adweek Marketing
AdExchanger Adtech
Digiday Media
MediaPost Industry
MarTech Platform
SiliconANGLE Technology

Professional Bio

Ken Brook builds businesses where markets need a better operating model.

Ken’s career follows a repeatable pattern: enter markets that are fragmented, opaque, or operationally inefficient, then build the product or system that makes them easier to adopt and scale.

He has founded and led ventures including StreamRoll Media, VidRoll, MetaX and adChain, and AdPrompt. Across those chapters, he has worked at the intersection of product strategy, technical leverage, and go-to-market execution.

How He Operates

What consistently defines his approach.

Category Sense

Spots markets where the workflow has broken down before the industry fully catches up.

Commercial Focus

Builds with revenue discipline, go-to-market clarity, and a strong bias toward practical outcomes.

Frontier Mindset

Works comfortably between established advertising systems and frontier technologies like blockchain and AI.

Selected Highlights

A record of company creation and commercial follow-through.

2013 Founded StreamRoll Media
2014 Launched VidRoll
2016 Started MetaX / adChain
2022 Founded AdPrompt

Selected Wins

Founder outcomes that reinforce the story behind the ventures.

Across multiple ventures, Ken’s work combines category timing, product execution, and revenue discipline.

Company Creation

Six ventures across advertising, market infrastructure, and AI.

Ken has launched companies across several waves of market change, from cross-screen media to blockchain verification and AI-driven marketing.

Commercial Execution

$10MM+ ARR achieved across the last three startups.

Public AdPrompt founder materials describe more than $10 million in annual recurring revenue generated across Ken’s last three startup ventures.

Category Leadership

Early builder in blockchain-based ad transparency through MetaX and adChain.

Before verification and accountability became central AI-era concerns, Ken was already working on auditable systems, cleaner market signals, and fraud reduction in digital advertising.

Current Momentum

Now focused on AI tools that make marketing more executable for smaller teams.

Through AdPrompt, Ken is now focused on helping businesses create and run marketing with less friction and more execution speed.

Media Coverage

Selected press and industry coverage across Ken Brook’s ventures.

Coverage has centered most visibly on MetaX and adChain, where Ken’s work on verification, fraud reduction, and blockchain-based advertising systems drew attention across business and adtech media.

Featured Coverage

The press moments that best capture the arc of Ken’s company-building story.

Forbes article image for MetaX blockchain coverage
Forbes 2017

How MetaX Plans To Use Blockchain To Stop Ad Fraud

A founder profile on Ken Brook and MetaX’s launch of adChain, focused on bringing more transparency to digital advertising.

MetaX / adChain Read coverage
WSJ The Wall Street Journal
The Wall Street Journal 2018

What’s an Online Ad Worth? Blockchain Might Help With That

Wall Street Journal coverage of how blockchain-based systems could improve trust, pricing, and accountability in digital advertising.

MetaX / adChain Read coverage
AdExchanger article image for MetaX coverage
AdExchanger 2017

Blockchain Is Bubbling Up As A Solution To The Supply Chain’s Transparency Woes

Coverage of MetaX’s early blockchain approach, including Ken’s perspective on how opaque supply chains weaken advertiser trust.

MetaX Read coverage
Adweek article image for blockchain advertising coverage
Adweek 2020

2 Years Ago, Blockchain Was Hyped as a World Changer. So What Happened?

Adweek revisited the blockchain wave in advertising and included Ken Brook and MetaX in its look at what the industry got right, what stalled, and what still mattered.

MetaX Read coverage

Media Archive

Additional industry coverage across adtech, verification, and market infrastructure.

Digiday article image for blockchain advertising coverage
Digiday 2017

Why Digital Advertising Is Experimenting With Blockchain

Digiday highlighted MetaX and adChain as part of the broader move to rethink verification, transparency, and fraud prevention in adtech.

MetaX / adChain Read coverage
MediaPost article image for Ken Brook coverage
MediaPost 2017

MetaX’s Brook On Web 3.0 Ad Serving

A commentary-driven feature focused directly on Ken Brook’s point of view about blockchain’s future role in programmatic media buying.

MetaX Read coverage
MarTech article image for MetaX blockchain whitelist coverage
MarTech 2018

MetaX Launches A Blockchain-Based Whitelist Of Websites

Coverage of MetaX’s adChain Registry initiative, expanding the product narrative from fraud prevention into publisher quality and trust.

MetaX / adChain Registry Read coverage
SiliconANGLE article image for MetaX adChain coverage
SiliconANGLE 2017

MetaX Wields Blockchain In Bold Bid To Clean Up Digital Advertising

Startup-focused coverage of MetaX’s attempt to use blockchain as a foundational upgrade to the advertising ecosystem.

MetaX Read coverage

Selected Documents

Primary-source materials connected to Ken Brook’s ventures.

Beyond media coverage and interviews, these documents show the product framing and technical thinking behind the ventures themselves.

PDF adChain Registry

The adChain Registry Whitepaper

A primary-source document outlining the adChain Registry vision for publisher quality and blockchain-based accountability in digital advertising.

Primary source • PDF • 922 KB Open whitepaper

Videos

Featured conversations, panels, and product videos connected to Ken Brook’s work.

A curated set of interviews, product videos, and public appearances that show the ideas and products behind Ken’s work.

Featured Videos

The best starting points for interviews, product context, and public appearances.

This set prioritizes the conversations that best reflect Ken’s current public point of view.

YouTube In Time Tec

Agentic AI and Better Ads w/ Ken Brook | Trust, AI Agents & Marketing | Tech Talks Episode 10

A podcast-style conversation on agentic AI, better advertising systems, and how autonomous software changes marketing operations.

Watch on YouTube
YouTube AdPrompt

Revolutionizing Local Marketing with AI Powered AdPrompt Agents

A product-focused look at how AdPrompt uses AI agents to help local businesses create, launch, and manage marketing faster.

Watch on YouTube
YouTube ExchangeWireTV

ATS London 2018: The Application of Blockchain

A conference panel appearance on how blockchain could change verification and market accountability across digital advertising.

Watch on YouTube
YouTube AdPrompt

AdPrompt.Ai Mission

A short mission-driven video introducing AdPrompt and its use of AI to simplify campaign execution for businesses that need more leverage.

Watch on YouTube

Video Archive

Earlier explainer videos from Ken’s blockchain advertising chapter.

These shorter archive videos add context to the adChain and MetaX era, showing how Ken explained blockchain, trust, and adtech transparency to broader audiences.

YouTube AdPrompt

AdChain Explainer Vid

An archive explainer that breaks down the adChain concept and the market need for more trusted infrastructure in digital advertising.

Watch on YouTube
YouTube AdPrompt

AdChain ELI5 Video

A simpler educational walkthrough designed to make the adChain thesis easier to understand for a broader, less technical audience.

Watch on YouTube

Venture Timeline

From advertising systems to AI-powered growth tools.

The founder story breaks into three chapters: media and monetization, verification infrastructure, and AI-native tools for marketers.

Chapter 01

Adtech Foundations

The early years centered on helping advertisers and publishers navigate fragmentation, monetization, and cross-screen complexity.

2013

StreamRoll Media

Founded during a wave of platform fragmentation, StreamRoll Media focused on helping marketers navigate cross-screen advertising more effectively.

2014

VidRoll

Built as a programmatic video monetization platform for premium publishers, with an emphasis on trading efficiency and stronger video revenue performance.

Chapter 02

Trust Infrastructure

The next chapter moved deeper into verification, market accountability, and blockchain-based systems for the advertising supply chain.

2016

MetaX / adChain

Helped pioneer blockchain-based advertising systems through adChain, with an early focus on verification, accountability, and fraud resistance across the digital supply chain.

Chapter 03

AI-Native Growth Systems

Today the focus is execution leverage: giving businesses smarter systems to create and run marketing.

2022

AdPrompt

Founded AdPrompt to simplify campaign creation, optimization, and multichannel advertising execution through AI-driven automation for businesses with limited time and resources.

Current Focus

Making sophisticated marketing systems easier for more businesses to use.

Ken’s current work at AdPrompt is centered on simplifying campaign creation, decisioning, optimization, and multichannel execution through AI.

Featured Venture

AdPrompt.ai

AdPrompt is Ken’s current venture, focused on helping businesses create, launch, and manage marketing with far less operational friction.

The site shows how AdPrompt turns AI into a clearer workflow for local businesses, growth teams, and marketers.

See the product vision, positioning, and current AI marketing direction. Visit AdPrompt.ai

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