The Test Set by Posit
Today: #178 in Technology, South Africa on our combined chart.
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Ranking history · New Zealand
Latest episodes
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The Bus Has to Jump 50 Feet — Greg Swinehart
October 12, 2026 · 54 minGreg Swinehart mocked up the first rstudio.org, and JJ Allaire and Joe Cheng sent it back for looking too good. He's been at it ever since, from hex stickers to Shiny's new look. He and Michael Chow get into the "JJ Allaire patented heat…
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You're the Base, AI Is the Exponent — with Tareef Kawaf
September 21, 2026 · 1 hr 18 minPosit CEO Tareef Kawaf’s theory about LLMs is that they work like an exponent on whoever you already are. Greater than one and you compound. Under one and you accelerate in the wrong direction. Michael, Wes, and Hadley chat with Tareef…
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Smuggled Gold and Untrustworthy Intuition — with Leland McInnes
September 8, 2026 · 60 minLeland McInnes has spent his career building tools a lot data scientists take for granted (UMAP, HDBSCAN), and amusingly the applications of those tools keep getting stranger. On this episode of The Test Set, he tells Michael, Hadley, and…
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Nobody Remembers Your 20 Charts — with Ruth Milligan
August 24, 2026 · 1 hr 2 minRuth Milligan has coached hundreds of conference speakers, curates TEDx Columbus, and wrote The Motivated Speaker. She's here to tell you that speaking is habitual, not natural. Michael, Wes, and Hadley get a live fifteen-second filler…
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Let the Agent Cook — with Trevor Manz
August 10, 2026 · 1 hr 11 minTrevor Manz went from measuring plant apertures by hand in a wet lab to building the notebook that lets coding agents take the wheel. The creator of anywidget and founding engineer at marimo (marimo.io/pair) popped into The Test Set to…
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The Answer Was Never Us — with Leilani Battle
July 27, 2026 · 1 hr 14 minLeilani Battle studies how software shapes what we see and believe. The University of Washington professor and co-director of the UW Interactive Data Lab talks with Michael, Hadley, and Wes about an experiment that manipulated people using…
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Curiosity, duty, and existential dread — with Joe Cheng
July 13, 2026 · 1 hr 6 minJoe Cheng is the CTO of Posit and the creator of Shiny. He joins Michael and Hadley to talk about why he almost walked away from AI work entirely over ethics concerns and what it takes to lead a team that didn't necessarily choose you…
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Confidently Incorrect — with Caitlin Colgrove
June 29, 2026 · 1 hr 0 minCaitlin Colgrove is the CTO of Hex, the data workspace for building and sharing data projects using SQL and Python that somehow counts a Sweetgreen chef as a power user. She joins Michael, Hadley, and Isabel to talk about what AI agents…
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The Bothness of It — with Alex Hillman
June 15, 2026 · 1 hr 14 minAlex Hillman built one of America's first co-working spaces, wrote a business book in tweets, and recently handed his inbox to a Claude Code agent — not to draft emails, but to notice when a friendship is going cold. In this episode, Alex…
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The Code Doesn't Lie — with Mike Bostock
June 1, 2026 · 1 hr 8 minMike Bostock made D3 when the browser was still a joke. He built bl.ocks when people needed somewhere to share their work. Now he's building Observable — reactive notebooks with an AI that actually looks at what it made. In this episode…
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The Wonder-Driven Builder — with Paige Bailey
May 18, 2026 · 46 minPaige Bailey is a developer relations engineering lead at Google DeepMind. She's a geophysicist-turned-AI-engineer who was once told by her professors that building open-source libraries was a waste of time. We talk about her path from…
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Widgets Are Lego Bricks (and Other Things People Are Sleeping On) — with Vincent Warmerdam
May 4, 2026 · 1 hr 16 minVincent Warmerdam has been the first full-time hire at a startup, a spacey punster who accidentally got himself a job, a bartender at an Amsterdam comedy theater, and a Dutch bike tour guide — and he'll tell you all of it was career…

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