Twitter Inc said on Friday one of its co-founders, Evan Williams, will be stepping down as a member of its board at the end of the month.

Williams, who also announced the move in a series of tweets, is currently the chief executive officer of online publishing website Medium and had also served as the CEO of Twitter.

"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," he tweeted.

While expressing his appreciation for almost 4,000 Twitter employees "who are doing the hard work every day," he added, "I will continue rooting for the team as I focus my time on other projects.”

Williams succeeded Twitter founder Jack Dorsey to assume the role of CEO in 2008 until 2010, when he was replaced by Dick Costolo.

Medium is a San Francisco-based online publishing tech company that Williams launched in 2012.

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