Fortune Magazine's Young Hotshots of 2013

Fortune Magazine's Young Hotshots of 2013

The Fortune Magazine's 2013 edition lists hotshot who are doing rocking businesses. From air-travel to natural gas, from genetic coding to goverment- all have been profiled.

Marissa Mayer

Age: 38
Title: President and CEO
Company: Yahoo
'Get in over your head' is Mayer's guideline. It's this career philosophy that has fueled her turnaround effort at Yahoo since she joined the company as CEO last year, at age 37, after more than a decade at Google. Mayer has replaced key Yahoo executives, made a string of acquisitions (22 so far, including Tumblr-see No. 24-for $1.1 billion), and overhauled Yahoo's culture and HR rules (its logo too) in an effort to make the company innovative again.

Revenue growth is her challenge, but investors like what our newly crowned No. 1 has done: The stock is up 86% since she came in.

Jack Dorsey

Age: 36
Title: Co-Founder and CEO
Company: Square
It was Dorsey who shared the world's first tweet, 'just setting up my twttr,' and conceived the idea to share a brief 'status.' Now, as Twitter readies its monster IPO, Dorsey is the only cofounder of the initial trio (Biz Stone, Ev Williams, and him) who still works at the company.

Dorsey had moved on to found Square, the vaunted mobile-payment system that now processes $15 billion annually (where he's CEO), but in 2011 he added the role of Twitter executive chairman and still helps drive big decisions.

Mark Zuckerberg

Age: 29
Title: Founder and CEO
Company: Facebook
It took 14 months, but shares of the social network finally topped their initial public offering price of $38 late this summer (now they're even higher). That's because Zuckerberg's mobile strategy at last appears to be working. Mobile-ad sales now account for 41% of Facebook's total ad revenue, and the number of people posting photos and status updates on the go surged 51% in the most recent quarter.

Facebook is also reportedly planning to launch TV-style ads that will cost brands up to $2.5 million a day. In other words, investors' confidence in Facebook-and Zuck-is back.

John Elkann

Age: 37
Title: Chairman
Company: Fiat
Elkann was picked for the Fiat board at age 21 by his grandfather Gianni Agnelli, the dapper industrialist who built the company into a global powerhouse. After Agnelli's passing, Elkann, thrust to the forefront by the untimely deaths of two potential successors, was named chairman of Fiat and chairman and CEO of Exor, the family's $142 billion holding company with interests in commercial real estate, banking, media, heavy equipment, and the soccer team Juventus.

Elkann-known as Jaki within the family-has led a striking turnaround: He stabilized Fiat and oversaw the successful investment in Chrysler, and has reorganized the far-flung family empire.

Rob Goldstein

Age: 39
Title: Senior Managing Director
Company: Blackrock
The math whiz, born in Canarsie, Brooklyn, heads BlackRock Solutions, the asset-management firm's $518 million division that offers advisory services, risk management, analytics, and tech platforms to governments and institutional investors.

He's added 150 clients to the firm's institutional business, and he's pioneering a new service-oriented approach to advisory while retooling a plan for a platform to circumvent bond brokers and their fees.

Brian Chesky, Joe Gebbia & Nate Blecharczyk

Age: 32, 32, 30
Title: Co-Founders
Company: Airbnb
In the five years since they launched it from a San Francisco loft, Airbnb has single-handedly legitimized couch-surfing as a hotel alternative-and provided a not-insignificant revenue stream for entrepreneurial homeowners. It's also become one of the most watched companies in the tech world, valued at $2.5 billion.

Now Chesky is CEO, Gebbia chief product officer, and Blecharczyk its CTO. Although Airbnb's reach already spans more than 33,000 cities and 192 countries, its biggest asset could be a growing trove of travel data about users.

Chris Weideman

Age: 38
Title: Chief of Staff
Company: U.S. Treasury Department
This Stanford Law grad was tapped in April to become newly installed Treasury Secretary Jack Lew's right-hand man, just in time to help navigate the department rattling IRS scandal. Weideman earned the job by distinguishing himself as a go-to fixer for Tim Geithner, so he knows how to handle an emergency.

Now he's sweating longer-term challenges too: a comprehensive rewrite of the tax code, the ongoing budget battles with congressional Republicans, and international headaches from Europe to China. That's a tall order.

Jun Wang

Age: 37
Title: Director
Company: BGI
Imagine a grain of rice that can suck pollutants out of the soil; or a cancer treatment so targeted and personalized it exists for only one person you; or a worldwide database of not just every human's genetic code but the genomes of every living thing, a sort of biological Google. This is the work of Wang, a genomics professor and the director of gene-sequencing center BGI (formerly Beijing Genomics Institute).

The institute generates about six terabytes of data a day, and it often falls on Wang to see the forest through the trees. He is a busy man: scientist, professor, author of more than 100 papers. His ultimate goal, he says, is to take these extraordinary things and sell them to ordinary people. It's already working. That depollutant rice may soon come to market.

Tracy Britt Cool

Age: 29
Title: Financial Assistant to the Chairman
Company: Berkshire Hathaway
Ever since Warren Buffett hired Cool, the daughter of Kansas farmers, out of Harvard Business School in 2009, he has heaped responsibilities on her. He named her chairman of four Berkshire-owned companies- Benjamin Moore, Johns Manville, picture-framer Larson-Juhl, and Oriental Trading and recently put her on the board of H.J. Heinz. 'She's a blotter for learning,' says Buffett.

Liv Garfield

Age: 38
Title: CEO
Company: BT Group's Openreach
As strategy director for BT (formerly British Telecom), Garfield made the $4 billion case for building out fiber broadband to 19 million U.K. homes. Now, as CEO of BT's infrastructure division, she's doing it, managing more than 20,000 engineers.

Recently named to the board of British megachain Tesco, she's said to be a contender one day for BT's top spot.