Bezos founded Amazon from his garage in Bellevue, Washington, in 1994. Decades later, gone are the photoshoots where he's posing with a softcover while looking bookish.

Now, he's gained pounds of muscle and changed his clothing style. He attributes his new look partly to working out with a celebrity personal trainer and changing his diet.

Meta CEO Mark Zuckerberg started Facebook from his dorm room at Harvard in 2004.

Zuck, who famously wore the same thing every day to save brainpower for more important decisions, has said goodbye to that era. Instead, Zuck can now be seen sporting graphic tees and chain necklaces.

Like Bezos, he's also gotten more fit. Part of Zuckerberg's physical transformation stems from hobbies like Brazilian jiu-jitsu and MMA fighting.

Dell is another member of the college dropouts-turned-tech founders club. He started his company while still enrolled at the University of Texas at Austin.

While you probably won't catch him rocking a t-shirt to a professional event, he's appeared to prefer to drop the glasses since then.

Larry Page and Sergey Brin founded Google in 1998. They met as students at Stanford and built Google from a garage they rented from the late Susan Wojcicki, who was later YouTube's CEO.

The photo at left shows Musk in 1999, around the time the "PayPal mafia" was formed.

Musk has said he doesn't care for exercise and "almost never" works out, though he's credited fasting and the weight loss drug Wegovy with his appearance today.

Gates and the late Paul Allen cofounded Microsoft from a garage in Albuquerque, New Mexico, in 1975.

Gates left Microsoft's board in 2020 and today spends more of his time focused on the philanthropic foundation he started with his now-ex-wife, Melinda French Gates.

Half a century later, he's still rocking glasses — with some different frames.

Twitter was founded in 2006. Cofounder Jack Dorsey has been seen with a full beard pretty regularly since departing as CEO and focusing his efforts more on cryptocurrency at Block, formerly Square.

Richard Branson started the Virgin brand in 1970 with a mail-order record business.

At 73 years old today, Branson's day-to-day life still features plenty of exercise, from tennis and cycling to kite-surfing. As such, he's usually sporting a tan.

Alibaba Group founder Jack Ma disappeared from public view in 2020 after criticizing China's financial regulation system.

He resurfaced in Thailand in 2022 and has been teaching as a visiting professor at the University of Tokyo.

Anne Wojcicki cofounded genetic testing company 23andMe in 2006. She is the younger sister of late former YouTube CEO Susan Wojcicki.

Whitney Wolfe Herd co-founded Tinder before founding Bumble in 2014. She stepped down as CEO of the dating app last year.

Herd became the youngest self-made female billionaire in the world on the heels of Bumble's IPO.

The entrepreneur currently serves as executive chairman on Bumble's board of directors.

Evan Spiegel co-founded Snap, which owns services like Snapchat, in 2011. The company's success made him the world's youngest billionaire in 2015, when he was 25.

While he'll often suit up or don a tux when attending a more formal event with his wife, Miranda Kerr, he's often seen in a white or black t-shirt and jeans.

Reed Hastings and Marc Randolph cofounded Netflix in 1997 as a DVD-by-mail service provider before it would become the streaming giant it is today. Hastings gave up the CEO title in January 2023, though he still serves as board chairman.

More recently, you can catch him in snowboarding attire after he bought a ski mountain in Utah.

Altman is best known as the CEO of ChatGPT maker OpenAI, but his first startup was Loopt, a mobile service that allowed for real-time location sharing with friends.

The picture at left shows him in those days, circa 2006. In 2008, he was sporting two polo shirts with a double-popped collar on stage at Apple's WWDC conference. 15 years later, however, he's worn a tuxedo to the White House while continuing to keep it casual during interviews with more casual looks too.