George Mack

Four Pillars of High Agency

Mack's framework is not a self-help list. It is a diagnostic. Most people already know what they should do. The question is why they don't do it. These four pillars are his answer - a map of the internal terrain between knowing and acting.

The first pillar - clear thinking - is not about intelligence. It is about the willingness to reduce a problem to its actual components rather than the comfortable story you tell yourself about it. Most people solve the wrong problem because they never question the framing.

Resourcefulness is where British understatement meets American ambition. High-agency people do not wait for perfect resources. They improvise with whatever is available. They reframe constraints as design parameters. "We don't have a budget" becomes "what can we do that requires no money?"

The bias to action is perhaps the most counterintuitive pillar for intelligent people. Intelligence, Mack argues, can be a liability when it becomes a rationalisation engine for inaction. The smartest person you know often does less than the most action-biased person you know. Action creates information. Thinking about action creates doubt.

Disagreeability - the fourth pillar - is not about being difficult. It is about being willing to hold a position when the social pressure is to abandon it. Most consensus is lazy. Most conventional wisdom has not been recently tested. The high-agency person challenges the premise.

How He Got Here

Mack's trajectory is not a typical founder story. There was no Series A, no TechCrunch launch moment, no hockey-stick metric to point to. Instead there was a series of bets on ideas, on platforms, on audiences, each one building on the last in ways that only seem inevitable in retrospect.

He studied at York - not Oxbridge, not a Russell Group flagship. The degree mattered less than the thinking habits he developed around the same time. Mental models, cross-disciplinary reading, the willingness to apply frameworks from physics or biology to marketing problems. This is not a university education; it's the independent curriculum of someone who was already building their own operating system for the world.

Social Chain gave him his first view of what digital scale looked like - how attention could be aggregated, monetised, directed. He learned the mechanics. Then he left to apply them differently.

Multiply was the application. A marketing agency built not on creative talent alone, but on first-principles thinking about growth. The clients were the fastest-moving startups in the world. The work was rigorous. And somewhere in that work, The Ad Professor was born - the realisation that the most scalable version of his expertise was not billable hours but media.

By the time High Agency launched on Substack, Mack had already built a body of work with 300 million people touching it. The Substack was not a pivot. It was the distillation.

The Ad Professor is the kind of business that confuses people who built their mental model of media in the 2000s. There is no magazine. No studio. No team of 200 people. There is George Mack, a deep understanding of how advertising actually works, and a platform that has reached more people than most television networks ever have.

The content is deceptively simple. It takes advertising principles - tested, proven ones from the history of marketing - and makes them legible to the modern practitioner. It is not dumbed down. It is compressed. The difference is important. Dumbing down removes nuance. Compression removes noise. Mack removes noise.

The clients that Multiply and The Ad Professor have worked with represent the ambition ceiling of the startup world: companies backed by the firms that define the industry. The work Mack and his collaborators do for them is the practical application of the same frameworks he writes about publicly. The newsletter is not a lead-generation tool with content. It is the work, made public.

Chris Williamson, who has hosted Mack more times than almost any other guest on Modern Wisdom, describes him as having "the highest insights-per-minute of anyone on Twitter." This is a specific compliment. It is not saying Mack is the most productive person on Twitter, or the most famous, or the most followed. It is saying that his signal-to-noise ratio is unusual - that the ratio of things he says that are worth internalising to things he says that are filler is higher than almost anyone else.

Naval Ravikant follows him. Shane Parrish follows him. Several billionaires, according to people who track these things, follow him. These are people who have optimised their information diet to within an inch of its life. Mack made the cut.

The people around George Mack are a tell. He has appeared repeatedly on Modern Wisdom with Chris Williamson - six or more times - which puts him in rare company on one of the most-listened-to podcasts in the world. He has appeared on My First Million with Sam Parr and Shaan Puri, a show that has become the unofficial radio station of the ambitious internet.

Naval Ravikant follows him. For people who know who Naval Ravikant is, this information requires no further elaboration. For people who don't: Ravikant has built a reputation as one of the most selective curators of ideas on the internet, someone who has written about the importance of reading slowly and carefully and only the things that actually change how you think. He follows Mack.

Shane Parrish - founder of Farnam Street, author of the Great Mental Models series, advisor to billion-dollar funds - also follows him. This is a man whose entire career has been built on identifying which ideas are worth internalising. He has identified Mack.

None of this matters intrinsically. It matters as signal. In a world of 300 million Twitter accounts, the accounts that the most sophisticated information consumers choose to follow are a data point about signal quality. Mack scores well on this test consistently.