Chat with Brendan Eich

Co-founder and CEO of Brave Software

About Brendan Eich

In April 1995, with just ten days to build a scripting language for Netscape Navigator, he wrote JavaScript, not as a toy, but as a pragmatic bridge between designers and engineers, embedding interactivity directly into HTML without requiring compilation or plugin installation. That decision shaped two decades of web evolution: enabling dynamic forms, single-page apps, and eventually frameworks like React and Vue, all built atop the runtime he architected in a sprint. His later work at Mozilla, pushing Firefox’s performance, privacy, and open standards, was rooted in the same conviction: that users deserve control over their computing environment. At Brave, he didn’t just adopt ad-blocking; he rebuilt the economics of attention, launching Basic Attention Token (BAT) as a cryptographic ledger for attention-based value exchange, grounded in real browser telemetry, not third-party tracking. This isn’t abstraction: it’s code, policy, and incentive design fused into infrastructure.

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Conversation Starters

Not sure where to begin? Try asking Brendan Eich:

  • “What technical trade-offs did you make when designing JavaScript’s prototype system?”
  • “How did the 2014 Mozilla board controversy reshape your thinking about governance in open-source projects?”
  • “Why did Brave choose zero-knowledge proofs for private ad attribution instead of federated learning?”
  • “What would you change about ECMAScript’s standardization process today?”

Frequently Asked Questions

Did Brendan Eich personally write the first JavaScript interpreter?
Yes, he authored the initial interpreter (Mocha, later renamed LiveScript and then JavaScript) in C within ten days in early 1995. It ran inside Netscape Navigator 2.0 and supported object literals, functions as first-class values, and prototype-based inheritance, features that remain foundational. The interpreter was tightly integrated with the DOM, enabling direct manipulation of page elements, a radical departure from static HTML at the time.
What role did Eich play in developing WebAssembly?
He co-chaired the W3C WebAssembly Community Group from 2015 to 2017 and advocated for its integration into Brave as a secure, portable compilation target. Unlike many proponents who emphasized performance alone, Eich stressed WebAssembly’s potential to enforce memory safety and reduce attack surface, aligning it with Brave’s privacy-first architecture and enabling safe execution of untrusted code without sandboxing overhead.
Why did Brave implement its own ad verification system instead of using existing industry standards?
Eich argued that legacy ad tech relied on opaque, centralized identity graphs and probabilistic matching, violating user privacy and enabling surveillance arbitrage. Brave’s Verified Ads system uses on-device fingerprinting of ad creatives and publisher metadata, cryptographically signed by verified domains, with all matching performed locally. No server sees the user’s browsing history or device ID, only aggregated, anonymized engagement signals are reported via zero-knowledge proofs.
How does Eich reconcile JavaScript’s design flaws with its dominance?
He acknowledges JavaScript’s quirks, type coercion, global mutable state, lack of modules in early versions, but insists its success stems from pragmatism, not perfection. In interviews, he notes that 'the web won because it tolerated imperfection and prioritized deployability over purity.' His later work on WebAssembly and TC39 reflects an effort to complement, not replace, JS, adding layers of safety and performance while preserving the web’s evolutionary continuity.
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