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Michael Seibel

Michael Seibel is a retired startup founder and investor, Twitch and Socialcam cofounder, and a host of Dalton + Michael, where he shares advice for people building companies.

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Michael’s happenings, collected from public sources, plus their backstory and Starbook, where fans write.

Known for

Overview

Based in
San Francisco, California
Education
Yale University, BA in political science, 2005
Known for
Justin.tv/Twitch, Socialcam, YC mentorship, and Dalton + Michael
Before startups
Finance director for a US Senate campaign in Maryland in 2006

Mini bio

How it started.

Before startups, Michael studied political science at Yale and worked in campaign finance. He moved to the Bay Area in 2006. In an essay about Justin.tv’s early days, he describes a founding team of three engineers and himself as the business person.

The breakout.

Michael was cofounder and CEO of Justin.tv, the company that became Twitch, and then of mobile video app Socialcam. Socialcam sold to Autodesk for $60 million in 2012. Under Emmett Shear’s leadership, Twitch later sold to Amazon for $970 million in 2014.

Sharing what he learned.

At Y Combinator, Michael became known for working directly with founders and explaining startup decisions in public talks and videos. He led the accelerator from 2016 to 2024, returned to a Group Partner role in 2024, and became Partner Emeritus in March 2025. His own website now describes him as retired.

Where fans can watch.

Dalton + Michael pairs him with Dalton Caldwell for conversations about building products, finding customers, fundraising, and life as a founder. Standard Capital brought the series back to YouTube in September 2025, and the two continued publishing conversations in 2026.

Creditschronological, newest first

Videos and teaching

Startups and mentorship

Awards

Quotes

Thankfully I learned the skill of sitting down and shutting up and this skill has served me very well.Michael Seibel, “The AM/PM Debate - or How not to be an idiot CEO”

Reflecting on a two-hour prelaunch argument about displaying AM/PM in Justin.tv chat. Source: https://www.michaelseibel.com/blog/the-am-pm-debate-or-how-not-to-be-an-idiot-ceo

Trivia

  1. He maintains CooksLarder.com to share favorite cooking ingredients and recipes.
  2. He also maintains JonathansApps.com, a collection of favorite iOS apps for kids.
  3. In 2021, he made a series of podcast shorts called Life, Work, and Startups with his brother Jason Seibel.
  4. One early Justin.tv debate with Emmett Shear lasted two hours and concerned whether chat timestamps should include AM/PM.

Find Michael

Find Michael’s posts and conversations with Dalton Caldwell.

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