Author · Decision Strategist · Mathematical Expert
Gary Levin
Professional card counter. Casino house mathematician. Founder of the world’s first brain injury rehabilitation home. Advisor in high-stakes environments. Business builder. Author of four books on probability, uncertainty, and the art of making better decisions.
Everything here comes from a life that was actually lived.
4
Books Published Decision-making & probability
Court-Recognized Expert
Mathematics of gambling
World’s First
Brain injury rehab home, 1982
40+ Years
Across multiple careers
Featured Book
The Thinking Manual
A Guided Thinking Workbook & Decision Journal
Most people don’t have a thinking problem. They have a thinking process problem.
The Thinking Manual is built on a simple idea: slow down, write it down, look at it clearly, and decide better. It gives you a structure for thinking through uncertainty with clarity instead of noise.
Books by Gary Levin
Each book approaches the same core challenge from a different angle: how to think clearly and act effectively when certainty is not available.
How To Make A Living Betting Horses
Surviving Uncertainty
Applied Mathematics
A probability-based framework for understanding horse racing markets and pricing risk with discipline.
Decision Thinking
A book about why life often fails to explain itself clearly and how to think better when feedback is misleading.
One Better Decision Every Day
Personal Development
A practical look at how small daily decisions shape direction, identity, and long-term outcomes.
The Thinking Manual
Workbook / Journal
A structured guide for slowing down interpretation, thinking more clearly, and making steadier decisions.
“I have been recognized by courts as an expert in the mathematics of gambling. That same understanding of probability and uncertainty is the foundation of everything I write.”
– Gary Levin
A Life Built in High-Stakes Environments
Gary Levin’s work is not theoretical. It comes from decades of real decisions, real risk, and real consequences.
He began as a professional card counter, then became a casino house mathematician. He later founded the first brain injury rehabilitation home in the United States, built a career in complex decision environments, taught mathematics, and helped grow and sell a businesses after major expansion.
Across every chapter of his life, one thing remained constant: decisions had to be made without perfect information.
That experience became the foundation for his books.
Start Here
Whether you want to explore the books, invite Gary to speak, or connect directly, this site is designed to make that simple.