Stewart Butterfield

Co-founder of Slack

Stewart Butterfield is co-founder of Slack, a messaging platform that’s used by more than 6 million people every day, including teams at eBay, Conde Nast, and IBM. The Canadian-born entrepreneur also co-founded and led Flickr until its acquisition by Yahoo!.

In his two decades working on the web, Stewart has been listed on Time Magazine’s 100 Most Influential People in the World and BusinessWeek’s Top 50 Leaders, and was named 2015 Technology Innovator of the Year by the Wall Street Journal.