Twitter has appointed Omid Kordestani, who until recently was Google's chief business officer, as its executive chairman.
Jack Dorsey, the company's chief executive and former chairman, announced the choice in a series of Twitter messages on Wednesday morning.
"Omid is a proven & experienced leader, who will directly help & coach me and our leadership, and help us recruit the best folks to Twitter," he wrote.
Mr. Kordestani, who has a reputation for affability and business savvy, could bring a level of calm and stability to Twitter, which has been plagued by management chaos during its nine-year history.
Mr. Kordestani was the 11th employee hired at Google.
He joined the company in 1999, when it was a year old, and helped create its primary business of selling the ads that appear in Google searches.