Wes Mckinney
About Wes Mckinney
Wes McKinney is the creator of the Python pandas library and a co-creator of Apache Arrow and Ibis. He wrote three editions of "Python for Data Analysis". He started pandas as a personal data analysis toolkit at AQR in 2007-2008. Before his later ventures he worked at Cloudera and Two Sigma Investments and co-founded DataPad.
In April 2018 he worked with RStudio (now Posit) and Two Sigma to create Ursa Labs, a not-for-profit open source group. Ursa Labs became part of Voltron Data in 2021, and Voltron Data's $110 million raise was announced in 2022. He was CTO and co-founder of Voltron Data and remains a Senior Advisor there.
Today he is Founder of Kenn Software, which builds AI developer tools such as agentsview, roborev and msgvault. He is also a Principal Architect at Posit, where he contributes to Python and AI strategy.
By his own account he has made more than 40 angel investments, focused on data infrastructure, data science, accelerated computing and developer tools. He says he started as a solo angel investing in data startups. He later launched Composed Ventures, which he describes as a micro VC fund, and he is its general partner. His site describes him as an active angel investor and advisor.
His public AI-related investing is tied to his data and developer tools focus. He took part in Row Zero's $10M seed round, announced on May 15, 2025 and led by IA Ventures. Row Zero said it would use the money to integrate AI into its spreadsheet and to improve support for Python-based workflows. The Lounge deals desk lists this round, but the press release and coverage I found date it to May 2025. I could not find other named AI investments with years.
He has said he prefers technical founders, especially technical CEOs. His thesis centers on a composable data stack, where data systems become more modular and interoperable. Composed Ventures covers data infrastructure, data science, accelerated computing, developer tools and deep tech. I found no public statement of check size, fund size or preferred geography.
- Row Zero: Seattle-based enterprise spreadsheet that connects to data warehouses such as Snowflake and Databricks. He participated in its $10M seed round announced in May 2025.
Investing activity
Wes Mckinney appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $10M. The most recent is Row Zero (Seed, $10M, Sep 2026).
Wes Mckinney most often invests alongside IA Ventures, Functional Capital, Ludlow Ventures and Founder's Co-op, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Wes Mckinney
Does Wes McKinney invest in AI startups?
He invests in data infrastructure and developer tools, and his own work now centers on AI developer tools. Row Zero, a seed investment that plans to add AI to its spreadsheet, is the one AI-related deal I could confirm.
What stage does Wes McKinney invest in?
He has not published a stage focus. His one confirmed round here is Row Zero's $10M seed, and he describes Composed Ventures as a micro VC fund.
What is Wes McKinney's check size?
No check size is public. Founders should ask him directly.
What does Wes McKinney look for in founders?
He has said he prefers technical founding teams, especially technical CEOs. He is interested in companies that make data systems more modular and interoperable.
What is Composed Ventures?
Composed Ventures is a micro VC fund where McKinney is general partner. It focuses on data infrastructure, data science, accelerated computing, developer tools and deep tech.
How can founders contact Wes McKinney?
He is on X at @wesmckinn and on LinkedIn, and his personal site is wesmckinney.com. He has no public pitch process that I could find.
Is Wes Mckinney an angel investor?
Yes. Wes Mckinney invests personally as an angel.
What AI companies has Wes Mckinney invested in?
Wes Mckinney's AI investments include Row Zero. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Wes Mckinney invest at?
In the rounds tracked on Lounge, Wes Mckinney has invested at Seed, with a median round of $10M.
Who does Wes Mckinney co-invest with?
Wes Mckinney's most frequent co-investors on Lounge are IA Ventures (1 deal), Functional Capital (1 deal), Ludlow Ventures (1 deal), Founder's Co-op (1 deal) and Trilogy Equity Partners (1 deal).