HomeMonthly Releases → September 2026
⚠️ Early Preview

Best Nonfiction Releases — September 2026

The most interesting nonfiction books coming out this month

📅 September 2026 · 7 Books

Do leaders actually change history — or would someone else have done it anyway? What if the problem isn't your willpower but the room you're standing in? Why are so many men unravelling? What does a lifetime of getting away with it look like from the inside? And will AI hand us a century of discovery, or quietly take away our ability to sit with another person? Seven books. No filler. Let's go.

Last updated: August 3, 2026 · This is an early preview — the final list, Pick of the Month, and video will be published as we get closer to September. Books may be added or swapped.

I'm Bjorn — I've reviewed 300+ nonfiction books over the last 10 years on YouTube (17k subscribers) and X (45k followers). Every month I dig through all the new releases so you don't have to. These are my honest picks.

📺 Video coming soon

The full breakdown will drop at the end of August.

Profits, Prophets, Coaches, and Kings by Jared Diamond
01
Profits, Prophets, Coaches, and Kings: (When) Do Leaders Matter?
Jared Diamond
History / Social Science / Leadership September 1

From the author of Guns, Germs, and Steel and Collapse — a Pulitzer winner who spent his career arguing that geography and technology shape civilizations more than individuals do — comes a book that turns the question on its head. Do leaders actually bend history, or would someone else have done roughly the same thing anyway? Diamond opens with a near-miss traffic accident in 1930 Munich that came close to killing Hitler, then works through cases where the answer swings both ways: Seretse Khama in Botswana, Rachel Carson, John Wooden at UCLA. 288 pages.

🎙️ Bjorn's take: "This is the great-man-theory question, and it's being asked by the man who spent thirty years arguing the opposite — that geography and systems matter more than any individual. That's what makes it interesting. Diamond built his entire career on the idea that leaders are mostly interchangeable, and now he's poking holes in his own argument. I keep thinking about this in the context of tech founders — does the specific person at the top actually bend the trajectory, or would someone else have done roughly the same thing? Diamond is one of the few writers who can hold that question without picking a side too early. 288 pages feels tight for him too, which is a good sign."
Read if:
  • You've read Guns, Germs, and Steel and want to see Diamond argue against his own reputation
  • You're interested in whether founders, CEOs, and leaders actually cause outcomes
  • You want big-picture history that doesn't flatter anyone
Buy on Amazon → Explore Human Nature Books →
Agency by Martin E. P. Seligman
02
Agency: The Psychological History of Human Progress
Martin E. P. Seligman
Psychology / History of Ideas / Human Potential September 8

Seligman founded positive psychology and wrote Learned Optimism and Flourish. His argument here is that agency — the combination of believing you can act, expecting it to work, and being able to imagine something different — is the hidden engine behind civilizational leaps. He traces it from Periclean Athens and the Hebrew Bible through the Renaissance and the Enlightenment to the civil rights movement and the AI era, and argues that when a society's sense of agency collapses, so does its progress.

🎙️ Bjorn's take: "Seligman is one of the most-cited psychologists alive, and he's making a huge claim here — that the feeling of agency is what drives civilizational progress, not just individual success. What I find fascinating is that this comes out the same month as Duckworth's book at #3, and she did her PhD under Seligman. They're answering the same question with different emphases — he says agency drives progress, she says agency is downstream of your situation. Teacher and student, same month, quietly disagreeing. Also worth noting: Cate Hall's You Can Just Do Things from the July list was the startup-founder version of this exact argument. Seligman is bringing the academic firepower."
Read if:
  • You believe your choices matter more than your circumstances — or want that belief tested
  • You liked Man's Search for Meaning, Learned Optimism, or Flow
  • You want psychology that operates at the scale of civilizations, not life hacks
Buy on Amazon → Explore Human Nature Books →
Situated by Angela Duckworth
03
Situated: Find the People and Places That Bring Out Your Best
Angela Duckworth
Psychology / Self-Mastery / Performance September 1

Ten years after Grit sold five million copies, Duckworth has written the book that complicates it. Her position now is that grit is necessary but frequently not enough — that the people, places, and objects around you do more work than willpower does, and that the productive question is not "what's wrong with me" but "where, and with whom, am I better?" She writes candidly about her own burnout and marriage. 352 pages.

🎙️ Bjorn's take: "I respect when an author complicates their own biggest idea. Grit sold five million copies and became a one-word philosophy — just push harder. Now Duckworth is saying: actually, it's not that simple. The environment you're in does more work than your willpower. That resonates with me. I've had periods where I was grinding on something and getting nowhere, and then I changed the context — different people, different workspace — and everything clicked. She's basically making the case that Atomic Habits made for individual habits, but at the level of your whole life. Where you are and who you're with matters more than how hard you try."
Read if:
  • You read Grit and found it didn't fully explain why some efforts stick and others don't
  • You've blamed yourself for failures that might have been environmental
  • You liked Atomic Habits, Nudge, or The Power of Habit
Buy on Amazon → Read Atomic Habits Review →
The Castle by Jon Ronson
04
The Castle: Adventures in a World of Unraveling Men
Jon Ronson
Psychology / Narrative Nonfiction / Society September 1

Ronson's first book in eleven years, and it started with texts from his son, who had been lured to a castle in the New England woods late one night. What begins as a father's alarm opens outward into the masculinity crisis — men building private worlds of ideology and disinhibition, a lawn-care influencer's career-ending stunt, two recently released murderers heading for Ronson's door. Told in the shape of a true-crime story, with the humour that made The Psychopath Test and So You've Been Publicly Shamed work. 336 pages.

🎙️ Bjorn's take: "Ronson is one of the few writers who can walk into weird, dark subcultures and come back with something that's both funny and genuinely disturbing. The Psychopath Test is one of my favourite nonfiction books, and he's been quiet for eleven years — so when he comes back, I pay attention. The masculinity crisis is a topic that gets talked about a lot but rarely investigated well. Most writers either sneer at these men or excuse them. Ronson does neither. He just goes and looks. The fact that this started with his own son getting lured somewhere makes it personal in a way his other books weren't. I have a feeling this one's going to hit different."
Read if:
  • You want to understand the manosphere from someone who actually went and looked
  • You liked The Psychopath Test, Going Clear, or Say Nothing
  • You want nonfiction that reads like a thriller and still leaves you thinking
Buy on Amazon → Explore Human Nature Books →
American Scoundrel by Kai Bird
05
American Scoundrel: Roy Cohn's Dark Journey from Joe McCarthy to Donald Trump
Kai Bird with Susan Goldmark
Biography / History / Power September 1

Kai Bird co-wrote American Prometheus, the Oppenheimer biography that won a Pulitzer and became a Christopher Nolan film. Here he turns to Roy Cohn — McCarthy's chief counsel at 24, later a fixer for the New York mob and a mentor to the young Donald Trump, indicted three times and acquitted three times, dead of AIDS in 1986 while denying he was gay. Kirkus describes the portrait as a narcissistic con artist and an avatar of the politics of resentment. Researched by Susan Goldmark, Bird's wife. 448 pages.

🎙️ Bjorn's take: "Kai Bird wrote American Prometheus, which became the basis for Nolan's Oppenheimer — and it's one of the best biographies I've ever read. So when he picks a new subject, I trust his judgment. Roy Cohn is one of those figures who keeps showing up in the background of American history — McCarthy's right hand, the mob's lawyer, Trump's mentor — and somehow never became the main character of his own book until now. This is also Diamond's question from #1 with the sign flipped: Diamond asks whether individuals bend history. Cohn is a man who unmistakably did, and the result was decades of damage."
Read if:
  • You want to understand how one lawyer shaped forty years of American power
  • You liked American Prometheus, The Power Broker, or Empire of Pain
  • You're interested in the psychology of people who never face consequences
Buy on Amazon → Best Biographies →
The Eureka Machine by Richard Socher
06
The Eureka Machine: Why AI Is the Key to Unlocking a New Era of Scientific Discoveries
Richard Socher
Technology / AI / Science September 22

Socher founded You.com, was chief scientist at Salesforce, and is one of the most-cited researchers in natural language processing. His claim is that AI will compress roughly a century of scientific progress into a decade — not by replacing scientists but by transforming every stage of how science gets done, from hypothesis to experiment to replication. Covers medicine, cell biology, neuroscience, economics, and astronomy.

🎙️ Bjorn's take: "I run most of BookLab alongside AI tools at this point, so I'm not neutral on this topic — but that also means I have opinions. Socher is a builder, not a journalist, and he's claiming AI will compress a century of scientific progress into a decade. That's an enormous claim. What makes this interesting is reading it against Turkle at #7 — they publish a week apart and disagree about almost everything. Socher sees AI as the greatest accelerant for human knowledge; Turkle sees it eroding our capacity for real connection. Same month, opposite conclusions. I want to see if Socher's argument holds up when you push past the optimism."
Read if:
Buy on Amazon → AI Founders Reading List →
Artificial Intimacy by Sherry Turkle
07
Artificial Intimacy: Who We Become When We Talk to Machines
Sherry Turkle
Psychology / Technology / Society September 29

Turkle has spent forty years at MIT studying what happens to people when they live alongside machines — Alone Together, Reclaiming Conversation. Her argument now is that if social media came for our attention, AI is coming for our capacity for attachment. She cites over 70% of teens and nearly a third of US adults using AI for companionship, many preferring it to human contact, and argues the real damage is that we start accepting the performance of empathy as empathy itself. Structured across the whole lifecycle, from a child's first attachments to how we face death. 288 pages.

🎙️ Bjorn's take: "This is the book on this list I'm most conflicted about — because I live this question every day. I work with AI constantly, and I've caught myself having moments where the line between tool and companion gets blurry. Turkle has been studying this since the 1980s, long before any of this worked, and her argument is that AI isn't just coming for our attention like social media did — it's coming for our capacity for attachment. Over 70% of teens using AI for companionship is a staggering number. If you've read Attached, this is the dark sequel — attachment theory being colonised by machines. Whether Socher at #6 or Turkle at #7 is right about AI might be the most important question of the next decade."
Read if:
  • You've noticed yourself talking to a chatbot the way you'd talk to a person
  • You liked Attached, The Shallows, or The Anxious Generation
  • You want a critique of AI written by someone who's studied it since before it worked
Buy on Amazon → AI Founders Reading List →

📬 Know a Book We Missed?

If there's a nonfiction release this month that deserves a spot on this list, let me know — I read every suggestion.

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