Cal Henderson

Co-Founder & CTO at Slack


Cal Henderson is the Co-Founder and CTO at Slack. Cal was previously the Director of Engineering at Yahoo! Inc, where they headed up engineering for Flickr. Prior to that, they were the Director of Web Development at LudiCorp Research and Development Ltd., where they created and built Flickr. Cal also spent time as the Director of Technology at EMAP.

Cal Henderson attended Birmingham City University, where they studied software engineering. Cal also attended Sharnbrook Upper School.

Some direct reports include Vanessa Martin - Director, Solutions Engineering, Serguei Mourachov - Co-Founder & Principal Engineer, and Matthew Norton - SVP, Global Solutions Engineering. Cal Henderson works with Sean Catlett - Chief Security Officer, David Schellhase - General Counsel, and Julie Liegl - Chief Marketing Officer. Cal Henderson reports to Stewart Butterfield, CEO & Founder.



  • Co-Founder & CTO

    Current role

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