Cal Henderson

Cal Henderson is the co-founder and CTO of Slack. He oversees Slack’s world-class engineering team and sets the technical vision for the company.

In 2019, he was named a Fortune 40 Under 40 honoree and recognized by the World Economic Forum as a Young Global Leader.

Previously, Cal built and led the engineering teams at Flickr, through its acquisition by Yahoo. An experienced technology leader and a popular speaker on engineering scalability, he authored the best-selling O’Reilly Media book Bu...