San Francisco: Twitter co-founder Evan Williams on Friday announced that he will be stepping down from the board of directors of the the micro-blogging site by the end of February 2019. “I’m very lucky to have served on the Twitter board for 12 years (ever since there was a board). It’s been overwhelmingly interesting, educational-and, at times, challenging,” Williams, who has served as the CEO of Twitter, tweeted on Friday.

Williams succeeded Twitter founder Jack Dorsey to assume the role of CEO in 2008 until 2010, when he was replaced by Dick Costolo. At present, he is the CEO of Medium, a San Francisco-based online publishing tech company that was launched by himself in 2012.

“Thank you, @jack and @biz for starting this crazy company with me—and continuing to make it better and better. And to my fellow board members, new and old—some of the most thoughtful people I’ve ever known. And, of course, thank you to the almost 4,000 Twitter employees who are doing the hard work every day, “Williams stated, expressinf gratitude towards Jack Dorsey, Biz Stone and his 4,000 employees.

He added,“I’m going to ride off into the sunset (or…down Market Street), so I can focus on some other things. I will always be rooting for the team (and, if someone lets me in, come by for lunch).”

In March 2006, Jack Dorsey, Noah Glass, Biz Stone and Evan Williams created the micro-blogging site Twitter.