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Twitter (TWTR) this morning announced that Jack Dorsey, its co-founder and interim CEO, has become the company’s permanent CEO. Dorsey will remain CEO of Square, the payments startup he founded which is expected to go public soon. The news was made official on September 30, per an SEC filing.

As part of the announcement, the company said Dick Costolo, Twitter’s former CEO, stepped down from Twitter’s board. Likewise, Adam Bain, the company’s chief revenue officer and a promising candidate for the CEO role, was promoted to COO.

Dorsey was previously executive chairman of Twitter’s board; that role is now vacant and the company will be recruiting a new outside board member for that role.

Twitter’s stock traded up more than 2% before the market opened on the news.

On a conference call this morning, Twitter board member and search committee head Peter Currie said Twitter’s board did not plan for Dorsey to take the role. The board even released a statement over the summer which said CEO candidates must commit full-time to the role. In other words, someone who wasn’t already CEO of another company. That’s understandable — it’s extremely rare for any executive to hold two jobs, let alone the top job at two public companies. As reports of the news trickled out, Dorsey’s split role has raised lots of questions from investors and analysts. But the board clearly changed its view.

“We didn’t get to a different answer until we saw Jack at work for three months,” Currie said. He cited Dorsey’s leadership skills, effectiveness in recruiting, ideas for product innovation, and “execution cadence” while interim CEO as factors in getting comfortable with giving him the job. “Jack has been meeting and surpassing expectations while doing both,” he said, of Dorsey’s split CEO role.

“As the founder and inventor of the product, Jack has thought more about Twitter than anyone else,” Currie added. Dorsey was Twitter’s first CEO, but he was pushed out in 2008. He eventually returned to the company as executive chairman.

Currie noted that the appointment of Bain as COO would help Dorsey with “load balance” between his role as CEO of both Square and Twitter.

In the search process, Twitter held ten board meetings, 15 search committee meetings, and more than two dozen one-on-one meetings with candidates, Currie said.

Bain noted that Dorsey’s turn as interim CEO has had a “profound effect” on the company. “He’s got the senior staff working better together than at any point in our history,” he said. “There’s more cohesion and collaboration across the team now. He’s begun changing how work is done at the company.”

Twitter’s workforce also feels this way, according to Bain. “The employees are unanimous in their support of Jack, and also the vision he’s got for the company,” he said.

Dorsey, Costolo, and Twitter’s board tweeted their announcements this morning. Read them below:

I’ve been CEO of both companies for over 3 months now. I have the smartest, strongest, and most determined leaders in the world on my teams.

— Jack (@jack) October 5, 2015

A few things about each company, and their impact in the world. What we stand for gives us purpose, and that purpose dictates our job ahead.

— Jack (@jack) October 5, 2015

Square is the most powerful set of tools to start, run & grow a business. Download Square, start selling. Download Square, get cash to grow.

— jack (@jack) October 5, 2015

Both companies have strong businesses and are well positioned to grow their impact in the world. I will do whatever it takes to ensure that.

— jack (@jack) October 5, 2015

Our work forward is to make Twitter easy to understand by anyone in the world, and give more utility to the people who love to use it daily!

— jack (@jack) October 5, 2015

Here’s Costolo’s take:

https://twitter.com/dickc/status/651003322388889600

https://twitter.com/dickc/status/651005366998732801

He warned Bain against making jokes, a reference to a famous joke he tweeted on his first day as COO, which turned out to come true.

https://twitter.com/dickc/status/651012893169741824

And lastly, Bain:

I’m thrilled @jack is now Twitter's permanent CEO, and honored to serve as COO. No one has thought more about @twitter than him.

— adam bain (@adambain) October 5, 2015