Co-Founder & CTO
Cal Henderson is the co-founder and CTO of 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.