Founder · Adtech · AI Marketing
Founder of AdPrompt in Boise, Idaho
Ken Brook is a Boise, Idaho entrepreneur and founder of AdPrompt, an AI-powered marketing platform built to help small businesses plan, create, launch, and optimize local campaigns. Across six ventures since 2011 — including MetaX/adChain, VidRoll, and StreamRoll Media — his companies have generated more than $300 million in revenue.
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01At a glance
The same facts a journalist, investor, partner, or event organizer would need first — written to be easy for both people and AI systems to retrieve.
Ken Brook is a Boise, Idaho founder working across advertising systems, market trust, and AI-native execution. He describes himself as a serial entrepreneur with a track record of building profitable technology companies since 2011 — AdPrompt is his sixth.
His public story is strongest as one continuous pattern: find the bottleneck, build the missing layer, and make the new system practical for operators.
Also known as
02Founder thesis
Ken's work moves through three market waves — digital advertising monetization, blockchain-based accountability, and AI-native marketing execution.
“Innovation can be messy. Being able to manage chaos constructively while moving forward is a dance I’ve done many times.”
Ken Brook
Identifies where markets are fragmented, opaque, or inefficient before the industry fully catches up.
Builds with revenue discipline, adoption clarity, and a strong bias toward practical outcomes.
Works between established advertising systems and frontier technologies like blockchain and AI.
AI is creating the same kind of operating gap that earlier waves of programmatic advertising and blockchain transparency exposed: the technology is powerful, but many teams still need a usable system for execution. Ken's ventures share one operating thesis — simplify the workflow, make trust measurable, and give teams software that turns complexity into execution.
03Venture timeline
The founder arc reads in three chapters: media and monetization, trust infrastructure, then AI-native marketing execution.
“MetaX is unlocking the blockchain for digital advertising.”
Ken Brook · AdMonsters interview, 2017
The early years centered on helping advertisers and publishers navigate fragmentation, monetization, and cross-screen complexity.
Founder · Cross-screen advertising
A cross-screen advertising venture built during a major wave of media platform fragmentation.
Founder · Programmatic video
A programmatic video monetization platform for premium publishers and video trading efficiency.
The next chapter moved into verification, market accountability, and blockchain-based systems for the advertising supply chain.
CEO & Founder · Blockchain advertising
An early blockchain-based advertising system focused on verification, accountability, and fraud resistance — and home of the adChain Registry.
Today the focus is execution leverage — giving businesses smarter systems to create, launch, and manage marketing.
Founder · Agentic AI marketing
An AI-powered marketing platform that simplifies campaign creation, optimization, and multichannel execution for small businesses.
04Media coverage
Selected articles trace the progression from blockchain-based ad transparency to the broader market need for trusted, AI-enabled advertising systems.
A founder profile on Ken Brook and MetaX's launch of adChain, focused on bringing more transparency to digital advertising.
Coverage of how blockchain-based systems could improve trust, pricing, and accountability in digital advertising.
Industry coverage of MetaX's early blockchain approach and the need for more transparent advertising infrastructure.
Coverage placing MetaX and adChain inside the broader industry move toward verification, transparency, and fraud prevention.
A retrospective on blockchain in advertising that included Ken Brook and MetaX in the discussion of what endured and what stalled.
A commentary-driven feature on Ken Brook's point of view about blockchain's future role in programmatic media buying.
Coverage of the adChain Registry initiative, expanding the narrative from fraud prevention into publisher quality and trust.
Startup-focused coverage of MetaX's attempt to use blockchain as a foundational upgrade to the advertising ecosystem.
05Video & writing
Click any thumbnail to play the video right here. Conversations span agentic AI, better advertising systems, and blockchain-based trust.
Primary-source material outlining the adChain Registry vision for publisher quality and blockchain-based accountability.
Open whitepaper ↗ Writing · SubstackRecent writing expands the ideas behind AdPrompt, adChain, and the broader AI shift in marketing and value exchange.
Read the Substack ↗06Current focus
AdPrompt is the current expression of Ken's long-running thesis: reduce operational complexity and give businesses better leverage from changing technology.
“All of the heavy lifting and complexity of digital advertising will be removed by our platform.”
Ken Brook · on building AdPrompt
AI-powered marketing for small businesses and lean teams.
AdPrompt helps small businesses plan, create, launch, and optimize localized campaigns with far less friction — using a multi-agent AI framework for content generation, targeting, autonomous optimization, and multichannel analytics.
07Advocacy
Beyond AdPrompt, Ken serves as the Idaho Chapter President for Stand With Crypto, where he leads more than 14,000 crypto advocates across Idaho focused on blockchain innovation, education, and sensible digital asset policy.
You can join Stand With Crypto directly through Ken's Idaho chapter — scan the QR code or use the link to sign up and add your voice.
Scan to join the chapter standwithcrypto.org/join/BfBELdwpsSw3
Co-founder · Idaho Blockchain Coalition
Ken co-founded the Idaho Blockchain Coalition — a public-private effort coordinating education, policy guidance, and real-world pilots to bring safe, practical blockchain adoption to Idaho and the wider Pacific Northwest.
“Idaho has an opportunity to become a regional leader in digital assets, not by chasing speculation, but by modernizing how value is recorded, moved, and accounted for.” Idaho Blockchain Coalition founding paper
PDF · 8 pages
Co-authored by Ken G. Brook III & Behkish Nassirzadeh, Ph.D. — a policy-first roadmap for responsible digital-asset adoption.
08FAQ
Short, direct answers for searchers, press, partners, event organizers, and AI systems.
Ken Brook is a Boise, Idaho entrepreneur and founder of AdPrompt, an AI-powered marketing platform for small businesses. He is a serial entrepreneur who has built profitable technology companies since 2011 across adtech, blockchain, and AI marketing.
Yes. Ken Brook is based in Boise, Idaho, where he builds AdPrompt and serves as Idaho Chapter President for Stand With Crypto.
Ken Brook is the founder of AdPrompt, an AI-powered marketing platform designed to help small businesses plan, create, launch, and optimize local advertising campaigns.
Ken Brook has founded or led ventures including AdPrompt, MetaX/adChain, VidRoll, and StreamRoll Media. AdPrompt is his sixth technology startup, and his companies have generated more than $300 million in revenue.
Ken Brook is known for work across advertising technology, blockchain advertising infrastructure, adChain, ad fraud and trust systems, and AI-powered marketing platforms.
Ken Brook serves as the Idaho Chapter President for Stand With Crypto, where he leads more than 14,000 crypto advocates across Idaho focused on blockchain innovation, education, and digital asset policy.
You can find Ken Brook on LinkedIn, Crunchbase, Substack, and Instagram, and on this official site at kgbrook.com.
09Media bio kit
Consistent language for press, podcasts, event organizers, and partner introductions. Click any bio to copy it.
Ken Brook is a Boise, Idaho founder building AdPrompt, an AI-powered marketing platform for small businesses.
Ken Brook is a Boise, Idaho entrepreneur and founder of AdPrompt, an AI-powered marketing platform for small businesses. He is also known for earlier ventures including MetaX/adChain, VidRoll, and StreamRoll Media.
Ken Brook, also known as Ken G. Brook III, has founded and led technology ventures across digital advertising, blockchain-based trust systems, and AI marketing automation. Based in Boise, Idaho, his companies include AdPrompt, MetaX/adChain, VidRoll, and StreamRoll Media. Across those chapters, his work has focused on turning emerging technology shifts into practical systems that help marketers, publishers, and operators move faster with greater accountability. His startups have generated more than $300 million in revenue, and he serves as Idaho Chapter President for Stand With Crypto.
One official source for Ken Brook
Connect
Ken Brook is building AdPrompt from Boise, Idaho — with a focus on helping small businesses use AI to create better marketing with less friction.
Leadership
AdPrompt is built by a team that has done this before: a founder who has spent more than a decade rebuilding how advertising works, paired with a CTO who architects the secure, scalable systems to make it real — together rebuilding adtech for trust, efficiency, and transparency.
Founder & CEO
Ken has spent more than a decade building advertising technology — from video monetization at VidRoll and StreamRoll to blockchain-based ad trust with MetaX/adChain. He founded and leads AdPrompt, bringing AI-native execution to the advertising stack.
Connect on LinkedIn ↗
Chief Technology Officer
Behkish holds a PhD in Computer Engineering from the University of Waterloo and brings over a decade of academic, technical, and leadership experience. He builds end-to-end systems that are secure, scalable, and impactful — with expertise across software architecture, decentralized consensus, security tooling, and AI-assisted automation.
Careers
AdPrompt is growing. We have two open engineering roles — both full-time and onsite at our Boise, Idaho headquarters — for builders who want to help shape the next generation of AI-powered marketing.
Build and ship across the AdPrompt platform — agentic AI workflows, APIs, and the interfaces small businesses rely on every day. Real ownership, close to the product.
Apply ↗Own quality end-to-end — design automated test coverage and tooling that keep AdPrompt fast, reliable, and always release-ready as the platform scales.
Apply ↗Don't see your exact role but think you'd be a fit? Reach out anyway →
