NBCUniversal’s global head of advertising Linda Yaccarino has resigned to join Twitter as its next CEO.

Twitter owner Elon Musk confirmed the lease on Friday in a tweet.

“I’m thrilled to welcome Linda Yaccarino as Twitter’s new CEO!” Musk tweeted. He said he will “mainly focus on business operations, while I will focus on product design and new technologies.”

He added, “I look forward to working with Linda to transform this platform into X, the everything app.”

The announcement comes the day after Musk he said via Twitter that he would step down from the role and that he would be the social media site’s new CEO, though he did not name a new person. Musk said in a tweet that the person will start in about six weeks.

Yaccarino joined NBCUniversal in 2011 and rose to the top of the company’s global advertising business. On Monday, the ad chief was scheduled to attend NBCUniversal’s Upfront event in Radio City, New York, a sales pitch the company and its media peers make each May for the ad industry.

The longtime advertising executive brings to Twitter a wealth of relationships with top CMOs and other advertising executives at a time when the platform has seen advertisers are fleeing – that’s why is losing billion dollars — after Musk took over last year.

Musk finished his acquisition for $44 billion on Twitter last October. Soon after, fired top brass and release thousands of employees.

Many companies have halted their advertising spending on the platform since Twitter saw an increase in offensive speech and rhetoric, as documented by several advocacy groups. In an effort to offset the loss of advertising revenue, Musk created a new subscription service, Twitter Blue, which offers features such as the ability to compose longer tweets.

Yaccarino and Musk sat down together main interview at a marketing conference in Florida in mid-April. During the conversation, the two discussed the role of marketers in the future of Twitter, as well as its place in the cultural conversation.

During the Musk conference supposedly have tried to reassure advertisers that Twitter is a respectable place for their brands.

Yaccarino’s departure from NBCUniversal comes weeks after Jeff Shell expulsion as the company’s CEO after admitting to an inappropriate relationship with an employee. Instead of replacing Shell, NBCUniversal’s top executives will report to Mike Cavanagh, the parent company’s president. Comcast.

On Friday, NBCUniversal said Yaccarino will leave the company effective immediately, and Mark Marshall, the current president of advertising sales and client partnerships, will become interim chairman of the company’s advertising and partnerships group.

Marshall will report to Mark Lazarus, chairman of NBCUniversal Television and Streaming. Lazarus and Marshall are likely to attend Monday’s NBCUniversal Upfront presentation, CNBC’s David Faber and Julia Boorstin reported Friday.

Disclosure: NBCUniversal is the parent company of CNBC.