In addition to lavish spending and hosting parties at luxury hotels, Linda Yaccarino has built a lifelong career in advertising.

You can compare this to Elon Musk, who sleeps on the couch of his friends homes.

As Twitter’s new CEO, Yaccarino replaces Musk as the company’s founder.

This new odd couple is the talk of Madison Avenue. Will they be able to work together?

This decision will determine the future of one of the most important social media companies in the world.

Since Musk took over Twitter in late October, many big-name advertisers have fled, and Yaccarino is tasked with regaining their trust.

Gwynne Shotwell, Musk’s No. 2, has long handled the day-to-day duties at SpaceX, freeing Musk up to focus on what he enjoys — like sending humans to Mars.

Yaccarino joins a company with 1,500 employees, many of them engineers and programmers who will still report to Musk as product development overseer.

Compared to her last job, Twitter’s advertising department is dramatically smaller. Over the past seven months, employees have endured rounds of layoffs and clients fleeing, partly due to Musk’s ownership changes, his content moderation changes, and his own controversial tweets.

The first major hurdle may be dealing with Musk. Perhaps Yaccarino will discover that a tightening economy, down-trodden ad market and shifting media landscape are nothing, compared to dealing with her now boss.