Stewart Butterfield is the co-founder and CEO of Slack He was also a board member of Rise. He is co-founder and CEO and a board member of Slack. He is an advisor at Dovetail Research and SignalFire. He is an angel investor. Prior to that, he served as senior director of product management at Yahoo and president and co-founder of Ludicorp Research and Development. In addition to these positions, he also served as managing director and secretary of Gradfinder.com. He holds a BA in philosophy and English from the University of Victoria and an MA in philosophy from Cambridge University.