Cal Henderson
Co-Founder & CTO at Slack
Cal Henderson oversees the engineering organization at Slack. He is an experienced technology leader, having previously built and led the engineering team at Flickr, through its acquisition by Yahoo.
As a popular speaker on engineering scalability, he authored the best-selling O’Reilly Media book Building Scalable Websites. He was a pioneer in the use of web APIs, and created the basis for OAuth and oEmbed, now used by YouTube, Twitter, and many others.
Cal has a BCS from the University of Central England, and was involved in London’s early online community through his work with the early digital community B3ta and his personal blog iamcal.com, which he has run for over 15 years. Cal now resides in San Francisco.
Manager
Direct reports
Allan Leinwand
SVP, EngineeringMatthew Norton
Head of Global Solutions EngineeringSherry Zhang
Senior Engineering Manager, DataAhmed Eid
Senior iOS DeveloperDevin Foley
Head of Native Client EngineeringGarrett Miller
Head of Engineering, Slack SystemsKevin Clark
Director, Security OperationsRoss Harmes
Chief of Staff to the CTOSerguei Mourachov
Co-founder & Java Backend Lead