I created pandas and co-created Apache Arrow and Ibis.
Founder at Kenn Software · Part-time: GP at Composed Ventures, AI and Python at Posit · Apache Member · Blog · Previously: Two Sigma, Cloudera, DataPad
| Project | Stars | Description |
|---|---|---|
| roborev |  | Continuous code review for AI coding agents. Runs in the background, reviews every commit as agents write, and surfaces issues in seconds — before they compound. |
| middleman |  | Local-first GitHub dashboard for maintainers to triage, review, and merge PRs and issues across repos. |
| agentsview |  | Local coding agent session viewer for Claude, Codex, and Gemini with analytics dashboard and full text search. agentsview usage is also a 100x faster replacement for ccusage. |
| msgvault |  | Archive a lifetime of email and chat locally. Full Gmail backup with search, DuckDB-powered analytics, an interactive TUI, and an MCP server for AI queries -- all entirely offline. |
| moneyflow |  | Personal finance data interface for power users, supporting backends like Monarch Money and YNAB. |
| Spicy Takes |  | 20+ prolific tech writers (Paul Graham, Martin Fowler, and others) analyzed by LLMs. Every post gets a TL;DR, quotations, and a spiciness rating. |
| VibePulse |  | Simple macOS menubar app to monitor your Claude Code and Codex token consumption. |
| kata |  | Local-first issue tracking for AI-assisted software work, with an agent-friendly CLI and human-facing TUI. |
| Project | Role | Stars | Description |
|---|---|---|---|
| Positron | Contributor |  | A next-generation data science IDE built on VS Code, supporting Python and R. |
| pandas | Creator |  | The most widely used data analysis library in Python. |
| Apache Arrow | Co-creator |  | Language-independent columnar memory format for analytics. |
| Ibis | Creator |  | Portable Python dataframe API for any backend. |
My book Python for Data Analysis is the most widely used introduction to the Python data stack -- pandas, NumPy, IPython, Jupyter. Now in its 3rd edition.
