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Stewart Butterfield is the co-founder and CEO of Slack, the platform for team communication which hundreds of thousands of professionals rely upon every day. Its customer list ranges from well-known startups like Buzzfeed, Pandora, Stripe and AirBnb to established giants like Adobe, Walmart, Comcast and PayPal. Prior to Slack, Stewart co-founded and lead Flickr from its inception in late 2003 through its 2005 acquisition by Yahoo! and until 2008 by which point it was one of the largest web services in the world with over 50 million users and billions of photos. In nearly two decades working on the web, Stewart has had a distinguished career as a designer, entrepreneur, and technologist. He has been named one of the 100 Most Influential People in the World by Time Magazine, BusinessWeek's Top 50 Leaders, among many other awards and has been featured in hundreds of articles and interviews. Butterfield graduated from the Universities of Victoria and Cambridge, with degrees in philosophy and retains academic interests in cognitive science, the history and philosophy of science, and economics. He lives in Vancouver.