Halicioglu worked for Facebook from October 2004 through November 2009. He had many roles to juggle but was a senior software and operations engineer when he left.
After Facebook, Halicioglu joined Blizzard Entertainment as a lead reliability engineer. Halicioglu is now a computer science and engineering lecturer at UC San Diego. He is also an angel investor and startup advisor.
Kaphan joined Amazon in the fall of 1994 and worked there until 1999. He was initially Amazon's VP of Research and Development. By the time he left, he was Amazon's CTO.
Now, Kaphan is doing what you'd expect most early employees to do: philanthropy and pursuing personal interests.
He never retained co-founder status at Amazon, although he brainstormed the startup idea with Bezos before Amazon was incorporated. He and Bezos had a falling out, but Bezos once called him "the most important person ever in the history of Amazon.com."
Silverstein was employed by Google from 1998 until 2012. He worked on various projects there, and he mentored engineers. Silverstein also helped build Google's search engine.
He is now Dean of Infrastructure at education startup Khan Academy.
Noah Glass was neighbors with Twitter co-founder Evan Williams. The pair co-founded Odeo, Twitter's predecessor, and he's often considered the forgotten co-founder of Twitter.
Later, Ev Williams fired Glass, and Glass was "shell-shocked." Glass told Business Insider in 2011 that he spent the next few years working in solitude. He's hard to find on social media and he hardly tweets anymore. Although he did tweet well wishes to the Twitter team after the IPO news hit.
He left Twitter with "a certain amount of equity" and a small amount of cash. His Twitter bio still reads, "I started this."
Markkula initially invested $250,000 in Apple in exchange for 30% of the company. Markkula had been an early employee at Intel, which made him a millionaire by the time he turned 30. The Apple investment was only 10% of his net worth at the time, according to "Return to the Little Kingdom."
At Apple, he was a manager who helped write the company's business plan, and he hired Apple's first CEO. Markkula also helped convince Steve Wozniak to join Apple full-time instead of joining HP.
Markkula left Apple in 1997. He's since invested in a few startups and donated money to Santa Clara University, for the Markkula Center for Applied Ethics.
Marc McDonald was the first salaried employee, aside from a freelancer who was payed a flat fee. He left in 1984 because the company was getting too big and joined Paul Allen's other company, Asymetrix.
He then joined a Seattle design company, Design Intelligence, which was acquired by Microsoft in 2000. That doesn't mean he's rich though. According to the AP, he has said he is worth less than $1 million.
Kravitz and Smith both attended Stanford alongside Snapchat's founders, Evan Spiegel and Bobby Murphy. Before joining Snapchat in June 2012, Kravitz was a Google intern.
Both were software engineer sat Raunk, a startup they built together. Their investor, Lightspeed, later invested in Snapchat.
Now they are software engineers at Snapchat (Smith's LinkedIn title is "Captain Captcha"). Smith build Snapchat's Android app.
"Both are still here and still awesome," the company says.
Brady, who was friends with Yahoo co-founder Jerry Yang in college, joined the company in 1995 and stayed until 2003. He wrote Yahoo's initial business plan.
When he left, Brady was Chief Product Officer. He then became CEO of an education company, QuestBridge. Now he is the founder of another education company, Imagine K12.
Ryan Graves found Uber in 2010, when it was still called UberCab, because he responded to a tweet written by now-CEO Travis Kalanick.
"Looking for a business development & product badass," the tweet said.
"Here’s a tip," Graves responded, tweeting back his gmail address.
Graves had spent two years at General Electric Healthcare, spending nights and weekends on a startup of his own that never got off the ground. He later spent three months as an unpaid "pseudo intern" working alongside Foursquare’s business development lead, Tristan Walker, but Foursquare declined to offer him a permanent position.
Graves helped Uber launch in June 2010. Shortly after, he was named the startup's first CEO. In December 2010, Kalanick took over for Graves as CEO.
Graves is still at Uber. He's on the board director and head of global operations.
Aston Motes graduated from MIT and interned at Google and Intel before joining Dropbox as its first employee. He also had a brief stint as a software engineer at OKCupid.
Motes worked on Dropbox's web product and its functionality. "If you’re using anything.dropbox.com, odds are good I coded it or broke it or fixed it at some point in time," he wrote on the company's blog.
Mote says he was a Dropbox fanboy from the very first time he saw Houston and his former MIT classmate, Arash, pitch it. He was hesitant to leave his OKCupid job in New York, but he followed his gut to California.
After four and a half years at Dropbox, Motes left to found his own startup, Assorted Bits.
Nick Grandy was Airbnb's first employee, and he joined in 2009. During his 2—3 year stint, he had a number of roles including full-stack engineer, product management, engineering management, online marketing, customer support operations, and international growth, according to his LinkedIn page.
Grandy is now a product manager at education tech startup, Clever.
Skoll met eBay founder Pierre Omidyar in 1996 and was hired to be the startup's first president. Even though eBay was profitable then, Skoll was the company's first full-time employee.
Skoll helped write the company's initial business plan. He remained president until Meg Whitman joined in 1998. He was once eBay's second-largest shareholder behind Omidyar.
After eBay, Skoll went on to found a film company in Los Angeles, Participant Media. He has also donated a lot of money to an entrepreneurship philanthropy, Skoll Foundation. Skoll is an investor in Tesla.
Riedel graduate from Reed College and joined Instagram when it was called Burbn, shortly after it raised $500,000 from Andreessen Horowitz and Baseline Ventures in March 2010.
Riedel was Instagram's Community Manager. He left the company in June.
Marco Arment joined David Karp when Tumblr first launched in 2007. He was the company's CTO and he stayed at Tumblr until 2010.
Arment has gone on to launch a few ventures of his own, including read-it-later application Instapaper, which he sold to Betaworks, and The Magazine, which he also sold.
In 2014 he launched a podcast application, Overcast. He's also an avid blogger.
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