Twitter announced Thursday that current CEO Dick Costolo will be stepping down from his post, effective July 1.
Jack Dorsey will be returning as interim CEO. This isn't Dorsey's first time in this post. He cofounded Twitter with Biz Stone and Evan Williams back in 2006, but left the company in 2008. He returned in 2010 to lead product, but ended up scaling back his responsibilities.
He will stay on as CEO of Square, the mobile payments company he founded in 2010, while managing new responsibilities at Twitter.
Dorsey first became a billionaire in 2012, and he is currently worth $2.4 billion.
Rebecca Borison wrote an earlier version of this story.
Dorsey began programming while attending Bishop DuBourg High School. At age 15, Dorsey wrote dispatch software that is still used by some taxi companies.
Source: Bio.
When he wasn't checking out specialty electronics stores or running a fantasy football league for his friends, Dorsey frequently attended punk rock concerts.
Source: The Wall Street Journal
Like many of his fellow tech billionaires, Dorsey never graduated college, though he briefly attended Missouri University of Science and Technology and transferred to New York University before calling it quits.
Source: Bio.
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