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.

  I support open-source data science through NumFOCUS and donate at least $1000/year.