Bill Gates is known as a co-founder of Microsoft and the leader of one of the world’s largest charitable foundations. Yet another habit connects those two identities at the root: reading.
For someone who has continued to read about 50 books a year—roughly one a week—reading has been less a hobby than a tool for understanding a complex world and deciding what to fund. Here we focus on how he reads and examine how he absorbs knowledge and turns it into something usable.
The Reading Principles Behind One Book a Week
Gates’s reading is distinguished more by “method” than “volume.” The rules he sets himself can be summarized in four broad points. Write copious notes in printed books.
Finish every book he starts even if he does not like it. Set aside a solid block of time. And remember acquired knowledge by connecting it to a larger framework. Let us examine them in order.
Writing in the Margins: Reading as Dialogue
Although he acknowledges the convenience of ebooks while traveling, Gates still prefers printed books. The reason is “to write notes in the margins.” For him, reading is not simply receiving information; it is a dialogue, and sometimes a debate, with the author.
Especially with nonfiction, he says he needs to check whether he can connect new knowledge with what he already knows, and taking notes is evidence that he is thinking seriously about the content.
Interestingly, he writes more in the margins when he disagrees. The more a claim conflicts with his beliefs, the more thoroughly he breaks down its logic and examines where its flaws lie—or whether his own assumptions are wrong.
This active approach supports his critical thinking. The same idea explains why he does not abandon a book he has started: sampling fragments would miss the full structure of the author’s argument.
Connecting Knowledge to a Single Tree
The fourth principle—connecting knowledge to a framework—is central to his memory. Gates says that after reading enough, similarities among things become visible and understanding becomes easier. With a broad framework, every piece of information can be placed appropriately within systems such as chronology, maps, or what is and is not known across scientific fields.
Isolated facts are difficult to remember, but given a peg such as historical context or a scientific framework, new information quickly settles into the right place in the mind.
It works like a chess master remembering a position as meaningful patterns rather than individual pieces. Elon Musk, who leads Tesla and SpaceX, similarly describes knowledge as a “semantic tree”: unless you understand the fundamental principles that form its trunk and large branches, the details that are its leaves have nowhere to hang.
By reading the currents of history and science, Gates grows a tree in his mind and fits newly acquired knowledge into it like puzzle pieces.
Why His Interest Shifted from “How to Make Things” to “How the World Works”
Having a framework also affects what one reads. When business publication Quartz manually classified 185 books Gates recommended on his blog from January 2010 onward, a clear change in his interests emerged.
Although he once led the world’s largest software company, in recent years he has recommended almost no books about programming or corporate management. Instead, the list features global issues such as climate change, energy, economic inequality, public health, and assistance to developing countries.
From competing over how to make things to understanding how the world itself works: the change in what he reads directly reflects a shift from micro to macro concerns.
Realism and Optimism: Two Authors Supporting His Worldview
Two authors support this new framework.
One is Vaclav Smil, professor emeritus at the University of Manitoba, a scholar who uses rigorous figures to explain the physical realities supporting society, including energy, food, and materials.
Through *How the World Really Works* and *How to Feed the World*, he uses dispassionate data to show the tremendous physical difficulty involved in moving away from fossil fuels and transforming food systems to feed a growing population.
A person who succeeded in the frictionless world of software is drawn to the physical constraints Smil describes and uses them as a basis for climate-investment decisions. This suggests a search for solutions that work in reality rather than drifting into idealism.
The other is Steven Pinker. Where Smil teaches the severity of reality, Pinker supports a data-based optimism that “the world is steadily improving.”
Gates cites as one of the most inspiring books of his life Pinker’s work using enormous datasets to argue that war and murder have declined dramatically on a historical scale.
Pinker’s 2025 book *When Everyone Knows That Everyone Knows...* uses examples such as indirectly asking someone to pass the salt and *The Emperor’s New Clothes* to discuss how people’s awareness changes collective behavior.
The interest lies in the idea that moving things on a global scale requires understanding how human awareness moves. Smil teaches real constraints; Pinker supports long-term hope. In Gates’s mind, the two function as the twin wheels of realism and optimism.
Using Fiction to Supply What Data Cannot Reach
Most of Gates’s reading is nonfiction, which he acknowledges offers returns in methods and knowledge. Even so, he deliberately mixes fiction and other people’s memoirs into his list to understand human subtleties and the depth of social division that data and logic cannot reach.
He says excellent fiction has the power to take us out of our own thoughts and into another person’s mind. Research also suggests literature trains the ability to infer others’ feelings and intentions; fiction works like a form of virtual reality that brings readers inside its characters.
After reading a book about racial disparities in the American justice system, he said that without mutual empathy, people cannot even discuss solutions.
Understanding people in different circumstances as individuals rather than statistical figures can be seen as deliberate training that prevents philanthropy from ending in cold efficiency.
Not Stopping at Reading: Turning Knowledge into Action
Gates’s reading bore its greatest fruit when it changed how he lived. True to his practice of always reading many books when starting something new, he devoured the history of earlier philanthropists while exploring how to give.
One work that resonated especially strongly was *The Gospel of Wealth*, an 1889 essay by steel magnate Andrew Carnegie. It argues that the wealthy have a duty to return their fortunes to society and contains the line, “The man who dies thus rich dies disgraced.”
Pushed by those words, Gates substantially rewrote his plans. He had initially intended to close the foundation after the couple’s deaths, but announced that he would donate virtually all his wealth over the next 20 years and close the foundation on December 31, 2045.
The plan would more than double the over $100 billion donated in its first 25 years by giving over another $200 billion during the remaining 20. The historical perspective cultivated through reading and his understanding of the urgency of the problems form the basis for this decision.
He also characteristically refuses to keep learning to himself. Gates privately acquired the rights to BBC footage of physicist Richard Feynman’s 1964 Cornell lecture series *The Character of Physical Law*, named it “Project Tuva,” and released it free with Microsoft Research.
His actions express a desire to pass to the next generation the same frameworks for understanding the world that he gained from reading and outstanding lectures.
What Reading Gives Him
Seen together, Gates’s reasons for emphasizing reading fall into three categories.
First, to build a framework for understanding the world structurally, something that following fragmented news alone cannot provide.
Second, to bring other people’s viewpoints into a mind inclined toward data through fiction and memoir.
And finally, to gain historical confidence that humanity has overcome difficulties before and use it to act even when facing hard problems.
He says people do not truly grow old until they stop learning, and that every book teaches something new and shows things from another angle.
More than the habit of one book a week, what we can imitate may be this entire practice of connecting what we read into a single tree, balancing reality and hope, and finally turning knowledge into action.
