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Kordestani was Google's chief business officer who recently stepped down to become an adviser at Alphabet and Google. Now, Kordestani "is no longer affiliated with Google," according to CNBC.
He was also one of Google's earliest employees, joining the company in 1999 as its "business founder" just one year after Larry Page and Sergey Brin founded it. He essentially built Google's business operations from scratch.
Based on Dorsey's tweets, it sounds like Kordestani will "coach" him and the rest of the company's leadership.
???? Today we're appointing @OmidKordestani to the Twitter Board of Directors to serve as our Executive Chairman!
- Jack (@jack) October 14, 2015
Omid is a proven & experienced leader, who will directly help & coach me and our leadership, and help us recruit the best folks to Twitter.
- Jack (@jack) October 14, 2015
A great chairperson is the first step towards continuing to make our Board one of the best in the world, and purpose-built to serve Twitter.
- Jack (@jack) October 14, 2015
Excited to work with @jack, the Twitter Board, @adambain, @anthonynoto and the rest of the team to grow @twitter's impact and business.
- Omid Kordestani (@omidkordestani) October 14, 2015
It's rare you get to be at a company with an amazing business that's also transforming the world.
- Omid Kordestani (@omidkordestani) October 14, 2015
I've had good fortune to be at three: Netscape, @google, and now @twitter.
- Omid Kordestani (@omidkordestani) October 14, 2015
This marks the second significant change to come to Twitter this week, and it's only Dorsey's second week as the official permanent CEO of the company.