
Cal Henderson
Built Slack from zero to $27.7B | Now advising the next wave of software founders

About
Cal Henderson built Slack from a side project into a $27. 7 billion company.
As co-founder and CTO for 15 years, he led the engineering, research, and design teams through IPO on the NYSE and Salesforce's acquisition in 2021. Cal now advises and invests in early-stage software companies, bringing hard-won lessons from scaling one of the decade's defining workplace tools.
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Slush AgAIn | Cal Henderson (Slack) & Laura Modiano (OpenAI)
In this Fireside Chat OpenAI’s Laura Modiano and Slack co-founder and CTO Cal Henderson explore how AI is reshaping the way we build, and the kind of founders the next decade will belong...
Cal Henderson at Slush 2026
Cal Henderson at Slush 2024
Cal Henderson at Dmexco 2016
| Event | Year | Location |
|---|---|---|
| Slush×3 | 2026, 2025 | 🇫🇮Helsinki, Finland |
| Slush 2024 | 2024 | 🇫🇮Helsinki, Finland |
| Dmexco | 2016 | 🇩🇪Cologne, Germany |
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