Which Business and Tech Titans Should Be on the 2014 TIME 100?

The billionaire hedge-fund investor showed just how much power Wall Street can wield by successfully lobbying Washington to investigate the nutritional-supplement company Herbalife, which Ackman has placed a huge bet against.

Brian Acton and Jan Koum became overnight celebrities of the tech world when Facebook bought their instant-messaging service for $19 billion in cash and stock, the company's priciest acquisition to date.

Barra is the first female CEO of a major automaker, and all eyes are on her as she faces a congressional inquiry into GM's recall of 2.6 million cars for a defect that has been linked to at least 13 deaths.

From his purchase of the Washington Post to the announcement that drones will soon be dropping deliveries on our doorsteps, Bezos has signaled that he will be reinventing businesses for some time to come.

Airbnb's co-founder and CEO is revolutionizing travel and making the hotel industry very nervous.

In the less than three years since he took over from Steve Jobs, Cook has fought off activist investor Carl Icahn and put his foot down about sustainability.

Costolo saw Twitter through its 2013 IPO, which blew past everyone's expectations, and now shoulders the responsibility of making sure the social-networking service turns a profit for shareholders.

This inventor may be known as the father of the iPod, but he turned to Google to sell his company Nest Labs, which makes smart thermostats and smoke detectors, for $3.2 billion.

Netflix gained an impressive number of subscribers, thanks to buzzy, original series like House of Cards and Orange Is the New Black, but CEO Hastings entered a public fray with AT&T over his recent Net-neutrality comments.

This legendary activist investor may have lost the fight to get Apple to restructure its finances, but he continues to use Twitter to push big companies to do even bigger things with their money.

As the owner of AMC Entertainment Holdings, China's richest man is now the world's biggest operator of movie theaters, as well as the owner of many department stores and luxury hotels.

Kalanick's mobile car service Uber continued to expand rapidly in 2013, and the company is working on making its controversial surge pricing more transparent.

This leader of the Harvard team that helped discover cosmic inflation made waves in the scientific community by providing evidence supporting Albert Einstein's Big Bang theory.

As the head of Alibaba, China's go-to guy for e-commerce is preparing for an IPO and looking at ways to help the environment by clearing pollution.

The Yahoo CEO and digital strategist is shaking up the traditional tech company and buying up hot startups like Tumblr along the way.

Microsoft's newly appointed CEO has been at the company for more than 20 years and is now responsible for steering the tech giant into a much more competitive future.

The Google CEO has big plans for the tech-based future that include artificial intelligence, self-driving cars and balloons that could connect remote parts of the world to the Internet.

The Facebook COO sparked a national conversation with her Lean In book and movement and, at just 44, continues to show her worth by becoming one of the youngest female billionaires in the world.

Spiegel received mixed reviews when he shared the idea for Snapchat in a Stanford class, but since he teamed up with former fraternity brother Murphy, the app has proved it's much more than a platform for naughty photos.

The Instagram co-founder saw his company grow 23% in 2013.

Cosmos has been a huge hit for the astrophysicist, who re-ups Carl Sagan's old TV show and explains the universe to viewers in an enlightening and entertaining format.

The LinkedIn CEO earned an astonishing 100% approval rating from his employees in a survey this year as the social-media platform continues to grow — 277 million members and counting.

The DNA-testing company 23andMe was ordered to cease sales in December until FDA approval, but if or when consumer genomics resumes, health care as we know it will completely change.

The Facebook CEO made waves after the social-media site purchased the messaging service WhatsApp for $19 billion and virtual-reality manufacturer Oculus Rift for $2 billion.

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