Over the past three years, Twitter hasn’t gone more than a few months at a time without some key executive departing. In that span, it’s had two CEOs, three COOs, and has run through nearly half a dozen VPs of product, among others.

That executive carousel was turning particularly fast in 2016. Twitter’s heads of product, engineering and media all left on the same day in January. Other VPs followed midyear, and by the end of 2016, COO Adam Bain and CTO Adam Messinger had also announced their departures.

In total, a dozen key VPs and senior executives departed, including 60 percent of Twitter’s listed executive team. It’s an issue that has been magnified because Twitter’s network is public and departing executives often tweet out goodbyes. Those leaving are easy to spot.

But! That means there are a lot of new faces running key projects at Twitter these days, some of them new to the company altogether, others simply moving up the ranks. Here are the folks you need to know.

Teresa Kroeger/Getty Images for Thurgood Marshall College Fund

Jack Dorsey, CEO

Dorsey (@jack) is CEO. ’Nuff said.

Brian Ach/Getty Images for TechCrunch

Anthony Noto, COO and CFO

Noto (@anthonynoto) is arguably the most important executive at Twitter right now. He’s leading all kinds of teams, including Twitter’s livstreaming video efforts.

Vjeran Pavic for Recode

Vijaya Gadde, General Counsel

As the company’s top lawyer, outsiders don’t hear much from Gadde (@vijaya), but her role is an important one: She runs the Twitter police. That is, everything related to policy and safety on Twitter rolls up to her, including the company’s decisions on banning users, or how to respond when other countries (like Turkey) decide to ban Twitter. Gadde has worked at Twitter since 2011, went to NYU School of Law and is also an angel investor with #Angels, an investment group made up of former and current female Twitter executives.

Anna Webber/Getty Images for American Express

Leslie Berland, CMO

Berland (@leslieberland) has the difficult task of managing Twitter’s public reputation. Twitter is a known entity at this point, which means her job is less about telling people what Twitter is and more about explaining to them why they should use it. In her first year at Twitter, we saw some of Berland’s efforts on display — Twitter rolled out a pretty good video ad last summer that actually explained what Twitter is for, and put ads around New York City and San Francisco last fall during the U.S. presidential election. Berland, who joined the company a little over a year ago from American Express, also oversees Twitter’s communications team.

LinkedIn

Ed Ho, VP of Product and Engineering

Ho (@mrdonut) has seen his role inside Twitter expand dramatically in the past year. Ho, who has been at the company for three years, now oversees all product and engineering at the company, reporting directly to Dorsey. Ho held jobs at a number of big-name tech companies before joining Twitter, including IBM, Yahoo and a five-year stint at Google.

John Lamparski/Getty Images for Advertising Week New York

Matt Derella, VP of Global Revenue

Derella (@Derella) has one very important job: Make. Twitter. Money. Derella was promoted late last year following the departures of COO Adam Bain and Sales VP Rich Alfonsi. Derella was already running all of Twitter’s North American sales efforts, including the ads it sold alongside its NFL game streams last fall. Now he runs all sales, and will garner a lot of attention as Twitter tries to jumpstart its business along with its user growth. Both have virtually flatlined. Derella joined Twitter in 2012 from Google. He reports up to Noto.

Asa Mathat for Recode

Kayvon Beykpour, Periscope CEO

Beykpour (@kayvz) joined Twitter two years ago when the company bought his livestreaming startup, Periscope. He has since integrated most of Periscope’s live video technology into Twitter, and the company recently promoted Beykpour to product and engineering head for all of its livestreaming video efforts. That’s a big deal because Twitter thinks livestreaming is a big deal — it wants to be a destination for TV-style live video, including live sports. It’ll be Beykpour’s job to make sure those streams work and people actually enjoy the viewing experience. Beykpour reports directly to CEO Dorsey.

LinkedIn

Keith Coleman, VP of Product

Coleman (@kcoleman) has the most dangerous job in Silicon Valley: He’s running product for Twitter’s core app. The job itself is not actually dangerous — computer coding is pretty safe, it turns out — but running Twitter’s app comes with vast amounts of pressure. Twitter users are notoriously particular about the service. Everyone believes things need to be changed, but no one likes when the company actually does anything. As a result, Twitter has moved slowly on product updates and iterations in the past, and it’ll be Coleman’s job to fix that. Coleman joined Twitter in December when the company acquired his startup, Yes Inc. He reports directly to Ho.

Drew Angerer / Getty

Omid Kordestani, Chairman

Kordestani (@omidkordestani) has the potential to impact Twitter in a number of significant ways. As Chairman of Twitter’s board, Kordestani is essentially Dorsey’s boss, a role that comes with more responsibility than usual given Twitter’s current struggles and Dorsey’s second job running Square. He’s also a former Google executive, an important connection considering Google has always been viewed as a possible Twitter acquirer. Kordestani is routinely seen at Twitter’s San Francisco office and will often attend its bi-weekly all-hands meetings. At Google, Kordestani was known as the company’s “business founder” and was its first sales boss.

Others to know

Kristin Binns, VP of Comms — Binns (@kristinbinns) deals with the press, and joined Twitter from health insurance giant Anthem late last year. Her timing was tough: Immediately after she joined Twitter, the company started exploring a sale, sold off assets and laid off employees. Welcome to Twitter, Kristin!

Ross Hoffman, VP of Global Content Partnerships — Hoffman (@hoff) has been at Twitter since 2010 and now runs the media team, which is really more of a sales-media-partnerships hybrid these days. Hoffman took over his current media role last summer.

Janae McDonough, VP of MoPub — McDonough (@JanaeR64) runs MoPub, the ad server Twitter bought in 2013 to fill ad inventory inside other developers’ apps. She’s been with MoPub since 2012 and joined Twitter through the acquisition.

This article originally appeared on Recode.net.

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