Who was the CEO of Twitter from 2015 to 2021?

Jack Dorsey was Twitter’s CEO from 2015 to 2021.

Dorsey was one of Twitter’s co-founders and served as its first CEO from 2007 to 2008. After leaving the role, he remained involved as chairman and later returned during a period of leadership uncertainty. He became interim CEO in July 2015 and was appointed permanent CEO on September 30 of that year.

During Dorsey’s second tenure, Twitter dealt with slowing user growth, intense debates about moderation and free expression, and pressure from investors. Dorsey also led Square, the payments company he had co-founded, making him unusual among major technology executives for running two publicly traded companies at once.

Dorsey stepped down from Twitter on November 29, 2021. Chief technology officer Parag Agrawal succeeded him immediately. Evan Williams was another co-founder and an earlier Twitter CEO, while Dick Costolo led the company before Dorsey’s 2015 return. Those overlapping roles explain why they are common wrong options, but Jack Dorsey is the correct answer for 2015–2021.