Stewart Butterfield is the CEO and cofounder of Slack. Over the past 20 years, he has had a distinguished career as an entrepreneur, designer, and technologist.

In 2014, Stewart helped found Slack, a new category of software that changed the way we work by bringing together people, applications, and data to help teams do their best work.
Before that, in 2003, he pioneered a new way of sharing information on the Internet when he co-founded Flickr and built the company as CEO into one of the largest web services in the world.

Stewart has a Bachelor of Arts (Hons) in Philosophy from the University of Victoria and an MPhil in Philosophy from the University of Cambridge. He retains academic interests in cognitive science, economics, organizational psychology, and the history and philosophy of science.