Thinking Outside Your Brain
How business owners can use AI as a thinking partner. Not another tools list. A fundamentally different way to approach your business.
Coming May 4, 2026
Get the Book“Thinking Outside Your Brain with AI” is a book by Roy Castleman, published in 2026 (Paperback ISBN: 978-1-0676727-0-6, Ebook ISBN: 978-1-0676727-1-3). Written for non-technical business owners, it explains how to use artificial intelligence as a cognitive partner, externalising your thinking to reclaim time, improve decision-making, and stop being the bottleneck. Drawing on Roy's experience building AI workflows that automated his podcast production from 2.5 days to 15 minutes and creating Agentic OS (an AI-powered business operating system), the book provides practical, tested methods that any business owner can implement without technical skills.
Your brain is full.
You are using it as a hard drive, a project manager, a strategy consultant, and a to-do list. All at once.
Every idea, every client issue, every half-finished plan sits in your head competing for attention. You lie awake running through tomorrow's decisions. You forget things you used to catch easily. The mental load is relentless.
You have tried AI tools. You have opened ChatGPT, typed a prompt, received something generic, and closed the tab. That is not what this book is about.
This book is about a fundamentally different relationship with AI. One where it becomes an extension of your thinking, not another task on your list.
What you will learn
Stop holding everything in your head
A practical method for externalising your thinking so your brain can focus on decisions, not storage.
Why AI tools fail most business owners
The real reason generic prompts produce generic results, and the context-first approach that changes everything.
The thinking methodology that took Roy from 90 hours to 5
The exact AI workflows Roy built in his own businesses. Step by step. Nothing theoretical.
Your first AI thinking session
Walk away from chapter one with a working AI thinking partner. Not a concept. A tool you use the same day.
About the author
Roy Castleman spent 28 years building IT service businesses. At his peak he was working 90 hours a week, had a million pounds in the bank, and was miserable. He nearly hospitalised himself from burnout.
He engineered his own escape. AI became his thinking partner, not another tool to manage. He automated his podcast production from 2.5 days to 15 minutes. He built Agentic OS, an AI-powered business operating system. His businesses now run in 5 hours a week while revenue stays the same.
This book is everything he learned, written for business owners who are where he was.
28 years in business · BOS UP certified coach · Wim Hof Level 2 Instructor · 2,500+ skydives
Read Roy's full story →Book details
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Stop thinking harder. Start thinking differently.
Available May 4, 2026. Paperback and Ebook.
Get the BookISBN 978-1-0676727-0-6 · By Roy Castleman