Meet 9 star executives who will help Jack Dorsey run Square while he's busy running Twitter

It's official: Jack Dorsey is going to be CEO of both Square and Twitter at the same time.

Although it helps that Square and Twitter are located just a few blocks away from each other, it's still a pretty enormous job.

Square will be going public soon and Twitter's stock has sunk below its IPO price as investors and analysts worry about whether it can ever become a mainstream product.

When Dorsey first took the reins at Twitter in June, it was supposed to be a temporary gig, and a person close to Square told Business Insider at the time that there was "absolutely not" any current employee who could take over if Dorsey did decide to leave.

Even without a designated Number Two though, Dorsey does have an impressive line-up of execs who will have to step up as he tries to manage two multi-billion-dollar companies at once.

Who are they?

In June, we put together this list of all Square executives, and nowDorsey will be relying on them more than ever:

Sarah Friar, CFO

Friar joined Square from Salesforce, where she was a top strategy and finance executive. Before that, she worked as an analyst at Goldman - which could be especially valuable since Square reportedly plans to go public this year.

Gokul Rajaram, Product lead for Caviar

It was a big loss for Facebook when Rajaram, who was in charge of developing new ad units, ditched for Square in June 2013. At Square, he's a product engineering lead, and focuses in large part on Caviar, the San Francisco-based food delivery startup Square bought for a reported $90 million last summer. Caviar is one of the startup's biggest efforts to diversify its line-up of products and services.

Before Facebook, Rajaram spent five years at Google, where his last job was Product Management Director, AdSense. He was also a product lead for several Google acquisitions and has been described by past colleagues as "a legend" and "beloved times ten."

Jesse Dorogusker, Hardware lead

Dorogusker has been leading hardware at Square for nearly four years, after spending the previous eight at Apple, most recently as director of engineering of iPod, iPhone, and iPad accessories. He's responsible for physical products like Square's signature card reader.

An early investor tells Business Insider that before Rajaram came in, he was essentially running all of product.

Francoise Brougher, Business

Brougher has a huge job at Square: as the business lead, she's responsible its international expansion, customer service, partnerships, and making sure that its products actually make money.

Before Square, she was a long-time Google vet, as VP of small business global sales and operations.

Brian Grassadonia, Product lead, Square Cash

Grassadonia joined Square as its first product manager nearly five years ago, and now focuses on the startup's consumer money transfer product, Square Cash. Since Square Cash first launched in 2013, it has processed over $1 billion annually and most recently introduced a way for businesses to accept payments through "$Cashtags."

Alyssa Henry, VP of seller business

Henry runs the product and engineering teams for everything Square makes for businesses, including Square Capital and Square Register. The company poached her from Amazon in 2014, where she was VP of its web services business, AWS.

Dana Wagner, General Counsel

Before coming to Square, Wagner was the public face of Google as it faced increased regulatory scrutiny, as its senior competition counsel.

A few years ago, Fortune named him one of tech's five most powerful lawyers, in part because of his role helping Square navigate government regulations.

Adi Roy, People

Roy heads up recruiting, human resources, and diversity initiatives at Square as its head of people, as of June. Before Square, he was at Google for nearly 10 years. His recent hire suggests that the company, which already has more than 1,000 employees, is looking ot bulk up even more.

Aaron Zamost, Communications

Formerly at Google for about four years, Zamost now leads Square's communications teams, no small job right now as the startup gets more attention than usual thanks to Dorsey's non-traditional dual-CEO-ship.