Stewart Butterfield (Enterprise Collaboration / SaaS) at Slack — San Francisco, United States

Stewart Butterfield co-founded Flickr and then Slack, both emerging from failed games (Game Neverending and Glitch). This pattern of pivoting gracefully — finding the valuable artifact inside a failed project — defines his entrepreneurial approach. Slack transformed workplace communication and was acquired by Salesforce for $27.7 billion in 2021, one of the largest SaaS acquisitions in history.