John Carmack

Create frugal operations with minimal overhead. Keep expenses low while you build, so that high margins fund growth and give you options.

id Software operated from a lake house where everyone lived and worked. They had no advertising, no HR department, no management structure. Their only expenses were food, computers, and Diet Coke. This allowed them to reinvest profits and maintain independence rather than needing external funding.

Minimize distractions and eliminate anything that doesn't serve your core purpose. Practice extreme intentionality in how you spend your time and energy.

Carmack owned nothing but a lamp, pillow, blanket, and books. He adjusted his sleep schedule to work 4 p.m. to 4 a.m. to minimize interruptions. When his cat Mitzi interfered with his ability to program, he got rid of her. This monastic approach gave him the mental clarity and focus needed to solve the hardest technical problems.

“The problem he found was that the PC was not powerful enough to handle such a game...Try the obvious approach first. If that fails, think outside the box.”

Protect your personal time and energy with the same vigilance you protect your code. Structure your life around your peak hours and eliminate interruptions.

When Carmack noticed that Romero's social commitments and celebrity activities were interfering with his level design productivity, he recognized the pattern from his own experience. He had already begun working 4 p.m. to 4 a.m. to create optimal conditions for deep work. This philosophy eventually led to Romero's removal.

“Beginning with Doom, he had decided to adjust his biological clock to accommodate a more monkish and solitary work schedule.”

Beware of losing focus as company success grows. Involvement in interviews, promotion, and corporate activities can subtly erode your core contributions.

Romero's involvement in death matching competitions, interviews, and advisory work for other studios gradually reduced his level design output from all levels in a game to only six of 32. Carmack noticed this shift and recognized it as a fundamental misalignment. The company eventually chose Carmack's vision of focus over Romero's broader empire building.

“Of the 32 levels of Doom 2, Carmack noted, only 6 were shaping up to be Romero's.”

Embrace obsession with problem-solving as your competitive advantage. Focus on understanding how systems work at the deepest level and find elegant solutions to technical challenges.

Carmack's defining characteristic was his ability to immerse completely in programming problems. He would work overnight until he solved technical problems that others thought impossible. His discovery of Adaptive Tile Refresh proved that seemingly insurmountable technical barriers could be overcome with deep focus and creative thinking.

“Try the obvious approach first. If that fails, think outside the box.”

Self-education and resourcefulness matter more than formal credentials. Teaching yourself what you need to know, often through independent study and experimentation, can accelerate your capabilities beyond what institutions provide.

Carmack learned programming through encyclopedias, books, and hands-on practice rather than formal education. He broke into schools to access computers when he couldn't afford them. He taught himself new programming languages in half the time it would take normal programmers, eventually becoming the industry's top talent without a degree.

“He read the passage about computers in the encyclopedia a dozen times.”

Do not attempt to milk existing technology beyond its peak. Innovate and move forward to the next technological breakthrough rather than extending mature products.

Carmack continuously pushed for technological innovation rather than making sequels or extensions of successful games. While Romero wanted to license the Doom engine to other developers to milk revenue, Carmack wanted to move on to Quake and new engines. This tension reflected their fundamental difference in philosophy.

Cut underperforming people and projects ruthlessly when they impede your core mission. Sentiment should not override business logic.

Carmack applied his programming philosophy of deletion to people. When Romero's level design output dropped due to his growing focus on interviews and promotion, Carmack voted to remove him. He also had no qualms about ending relationships with Scott Miller and other contributors when they ceased adding value.

“The same rule applied to a cat, a computer program, or for that matter, a person. When something becomes a problem, let it go, or if necessary, have it surgically removed.”

Seek founders and partners who are different from you but share your core values. Complementary skills create better outcomes than identical perspectives.

Carmack and Romero succeeded together precisely because they were opposites. Carmack provided technological brilliance while Romero provided creative vision and business instinct. However, they shared a passion for making great games. When their core values diverged, the partnership failed.

Success can reveal fundamental misalignment in founder values and visions. Two people can be perfect partners in building, but terrible partners in running a mature business.

The breakup between Carmack and Romero wasn't caused by failure, incompetence, or conflict. It was caused by their radically different philosophies about what to do with success. Romero wanted to enjoy it and build an empire. Carmack wanted to keep pushing technology forward. Both were rational, but incompatible.

“He wants an empire. I just want to create good programs.”

Books and ideas from thought leaders can fundamentally redirect your life trajectory. Read widely in your field to understand what is possible and who is pushing boundaries.

Reading Stephen Levy's Hackers book was transformative for Carmack. It showed him a lineage of programmer-visionaries from MIT through Silicon Valley and convinced him he was meant to be among them. This single book catalyzed his determination to pursue programming at the highest level.

“When Carmack finished the book one night in bed, he had one thought. I'm supposed to be in there.”

Create your own world when the external world doesn't fit you. Building a company or product allows you to have meaningful control over your environment and circumstances.

Both Johns felt like outsiders in their early lives, pressured to conform by parents and institutions. They found freedom and power through creating video game worlds where they controlled the rules and outcomes. This desire to build their own world manifested in id Software as their vehicle for personal and creative control.

Question and reject systems that don't make sense, even when they have institutional backing. Challenge dogma and authority when evidence contradicts them.

Carmack hated the structure of formal education and challenged teachers' beliefs in class. He rejected his mother's attempts to enforce extra credit through punishment. This willingness to question authority extended to his rejection of patents and intellectual property restrictions, which he saw as fundamentally antithetical to innovation.

“Why can't you just give us a project and let us perform it?”

Reject patents and intellectual property restrictions. Knowledge and innovation are built on the work of predecessors, and restricting ideas slows human progress.

When his employer Al suggested patenting the Adaptive Tile Refresh technology, Carmack became angry and threatened to quit. He believed all science and technology are built on prior work, and claiming ownership of ideas prevents others from building upon them. This hacker ethic shaped his entire philosophy toward innovation.

“All of science and technology and culture and learning and academics is built upon using the work that others have done before...If the world became a place in which he couldn't solve a problem without infringing on someone else's patents, he would be very unhappy living there.”

Maintain creative control and ownership of intellectual property in all partnerships. These assets are more valuable long-term than quick payment from distributors.

When Ron from Good Times Interactive offered $2.5 million for id Software, they initially refused because the deal didn't include creative control and IP ownership. They eventually negotiated terms where id owned the IP and appeared prominently on all merchandise. This preserved their long-term value.

Scale a company only to the size needed for your core mission. Adding management, overhead, and complexity dilutes focus and slows innovation.

After Romero was pushed out, Carmack downsized id intentionally. He stated they could make the best games in the world with three programmers, three artists, and three level designers. He scaled back publishing to focus solely on development. This ran counter to Romero's empire-building vision.

“I believe that three programmers, three artists and three level designers can still create the best games in the world.”