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Twitter has appointed Omid Kordestani, a longtime Google exec who most recently was the company’s chief business officer, as its new executive chairman.

Kordestani’s appointment, announced in a series of tweets, comes after Twitter installed co-founder Jack Dorsey as its permanent CEO last week, with Dorsey relinquishing the chairman role. On Monday the company announced plans to lay off up to 8% of its workforce.

“Omid is a proven & experienced leader, who will directly help & coach me and our leadership, and help us recruit the best folks to Twitter,” Dorsey tweeted.

Kordestani joined Google in 1999 as “business founder” — and employee no. 11 — overseeing the development of its initial business model. He left his last operation role in 2009 and became a special adviser to the company. Last year Google named Kordestani senior VP and chief business officer overseeing all revenue and customer operations, as well as marketing and partnerships, before he shifted again into an advisory capacity.

Before joining Google, Kordestani held leadership roles at companies including Netscape, Hewlett-Packard and Go Corp.