Cal Henderson is the co-founder and CTO of Slack. He is a world-renowned expert, author, and speaker. Cal is a pioneer in the use of APIs and created the basis for oAuth and oEmbed, now used by YouTube, Twitter, and many others. Ali Rayl is Director of Customer Experience and is one of Slack's earliest employees. Her team drives Slack’s mission to make its 2.3M+ daily users’ working lives simpler, more pleasant and more productive. Prior to Slack, Ali was the Director of QA at Songbird, one of the world's first open-source cross platform music platforms.