Ev Williams speaking at Web Summit 2018 Lisbon, Portugal. Photo: Diarmuid Greene/Sportsfile via Getty Images
Twitter co-founder Ev Williams is stepping down from the company's board after 12 years.
Why it matters: Williams helped start the company in 2006 and was Twitter's CEO from 2008 to 2010. He's currently running Medium, an online publishing service, while also investing in startups.