Seattle-based hacker, designer and researcher. PhD candidate at the University of Washington. I make tools that help people debug their programs more effectively.
My ideal job is one where I can brainstorm, prototype, and ship groundbreaking features that make developers more happy and productive. I do whatever is necessary to invent better tools—whether that's user research, prototyping interfaces, or coding up new browser rendering engine capabilities.
Up to now, I have focused on tools for web developers and browser engineers. I'm also interested in improving code quality, bug reporting, debugging, testing, and development processes.
Deterministic replay is a fundamental enabling technology for advanced developer tools. My dissertation work investigates deterministic replay in the browser: how to capture and replay web applications; affordances for navigating to relevant program states; and debugging tools that use past program states to explain behavior.
Dolos is a modern, low-overhead deterministic replay infrastructure for capturing web application behavior. Dolos is being upstreamed into the WebKit project.
Timelapse is the first user interface for capturing and replaying web application executions directly from the browser's developer tools.
Probes enable a developer to add logging statements to a live or captured execution while it runs. Time-indexed outputs are a scheme for indexing and seeking playback to text outputs such as console logging.
I am a reviewer on the WebKit project, with a focus on developer tooling. In my spare time, I have been upstreaming Dolos and other parts of my dissertation.
Servo is an experimental browser written in Rust that explores new ways to parallelize, decompose, and secure a rendering engine for web content. I prototyped the current layout subsystem (block/inline/text layout), and worked on many other things.
# Other Projects
glsl-simulator: an experimental simulator for WebGL Shader Language. Using the simulator, browser developer tools can implement standard debugging tools such as stepping through control flow, introspecting live state and adding logging.
C3: a research infrastructure for extensible, type-safe web browsers. I wrote a rendering engine for inlines, blocks, floats, and tables in C#.
Scry: Explaining Visual Changes in Web Interfaces.
On the Use of Delta Debugging to Reduce Recordings and Facilitate Debugging of Web Applications.
Interactive Navigation of Captured Executions via Program Output.
'War Stories' of Debugging.
Interactive record/replay for web application debugging.
C3: An extensible, reconfigurable platform for HTML-based applications.