Shane Parrish

Shane Parrish is a Canadian author and creator of the Farnam Street blog whose book Clear Thinking distills mental models and decision-making frameworks into practical guidance.

Shane Parrish built a devoted following with his Farnam Street blog and podcast, which focus on mental models, decision-making, and the application of cross-disciplinary thinking to real-world problems. Clear Thinking is his most focused and practical book: an argument that most of our failures come not from lack of intelligence but from defaulting to automatic, reactive thinking when situations call for deliberate reasoning, and a framework for building habits that create conditions for better decisions.

The book draws on behavioral psychology, business cases, and philosophical traditions to identify common thinking traps — the bias toward action, social conformity, status defense — and to propose practices for countering them. Parrish writes with clarity and practical orientation, and the book is structured to be actually usable rather than merely inspiring. His emphasis on building good processes rather than trying to make better in-the-moment decisions is a genuinely useful distinction.

Clear Thinking covers ground familiar to readers of behavioral economics and decision science — Kahneman, Thaler, and Cialdini cover much of the underlying research more rigorously. Parrish’s contribution is synthesis and practical application rather than new insight. For readers who want a well-organized introduction to evidence-based decision-making with concrete takeaways, it is a strong entry point. For those who have already read widely in the space, the ground will be familiar.