Scott Kelly spent a year on board the International Space Station. During that time, his identical twin brother Mark — who's also an astronaut — was on Earth. Since then, scientists have been watching how differently the two have aged. Kelly's now retired, but that doesn’t mean he’s taking it easy. He wrote a memoir about his year in space called Endurance, and has become an advocate for improving science and math education in the US. On this episode of "Success! How I Did It," host Rich Feloni talks with Kelly about what he saw in space, what he missed back on earth, and how he went from a kid who couldn’t focus to one of the most famous astronauts of our time.

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Nat Turner was 24 when he sold his first company for $80 million. He sold his next one this past February – this time, it was for $2 billion. Nat Turner is the cofounder and CEO of Flatiron Health, a company that's changing the way cancer researchers collect data, with the goal of transforming the way patients are treated. He was inspired to start the business when his younger cousin was diagnosed with leukemia. And while he's been an entrepreneur since he was a kid — in high school he had a thriving snake breeding business — he feels emotionally connected to Flatiron in a way he never had with his past companies. On this episode of "Success! How I Did It," Business Insider's Rich Feloni speaks to Turner about why he built Flatiron Health, what breeding reptiles taught him about entrepreneurship, and the importance of believing in your company's mission.

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Peter Diamandis has made a career of fulfilling his childhood dreams. He’s the man behind companies that make science fiction come true: The XPRIZE, Singularity University, and Human Longevity Inc. They’re as wild as they sound. On this episode of "Success! How I Did It," Business Insider's Rich Feloni speaks to Diamandis about becoming a doctor to appease his parents, experiencing zero gravity with Stephen Hawking, and how he's working now to increase the human lifespan.

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Chris Hughes is a Facebook cofounder, and author of the new book "Fair Shot." Hughes worked at Facebook for just three years, but his 2% stake in the company made him $500 million. Hughes' new book reflects on the incredible luck he had early in his career, and how it illustrates something wrong with the economy today. Part personal manifesto, part policy proposal, Hughes makes the case for a a guaranteed income in the US, with people in the highest income bracket – like him – footing the bill. His belief in the the project was borne out of his unexpected career path, and his evolving idea of what it means to be successful.

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This week, we have a double header from the World Economic Forum in Davos, Switzerland: Craigslist founder Craig Newmark and KPMG chairman and CEO Lynne Doughtie.

Doughtie spent her entire career working her way up the ladder, and became the first female chairman and CEO of KPMG in 2015. KPMG is one of the big four professional services companies that other companies hire to do things like accounting and auditing. She spoke with Business Insider's US editor-in-chief Alyson Shontell about her love for accounting, how she bounced back after not making partner as an auditor, and what it was like to be one of the few female CEOs at the World Economic Forum. 

Craig Newmark started an email list in 1995. Eventually it became a website by the name of Craigslist, and selling furniture, renting apartments, and finding a missed connection would never be the same. Newmark isn't too involved with the website anymore, but he spoke with Business Insider's UK editor-in-chief Jim Edwards about becoming the Craig of Craigslist and how he followed his own path to build one of the web's most iconic brands.

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Cindy Robbins started at Salesforce 12 years ago, and worked her way up the ranks before getting a life-changing phone from CEO Marc Benioff. Janet Foutty, Chairman and CEO of Deloitte Consulting, has been at Deloitte for 26 years and seen firsthand the challenges women face on their way to the top. Business Insider's US Editor-in-Chief Alyson Shontell spoke with both Robbins and Foutty in January, at the World Economic Forum in Davos, Switzerland. From the gender pay gap to the shortage of women mentors to the importance of taking on projects outside your comfort zone, Shontell, Foutty, and Robbins discuss a range of topics this episode of "Success! How I Did It," from Business Insider.

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Peggy Johnson gets paid millions to help make Microsoft billions. Her actual title is executive vice president for business development, and she's helped lead over 40 investments with Microsoft Ventures. One deal was the acquisition of LinkedIn — for $26 billion. She joined the company three years ago after spending 25 years at the telecommunications company Qualcomm. Microsoft CEO Satya Nadella personally called her on a Saturday to get her on board. Business Insider US Editor-in-Chief Alyson Shontell recently caught up with Johnson at the World Economic Forum in Davos, Switzerland. On this episode, Johnson talks about making it to Microsoft and how her team decides which companies to invest in or acquire.

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Entrepreneur and Shark Tank star Daymond John. John grew up in Queens, New York, where he dreamed of making clothes for hip hop stars. He turned his mom's house into a factory, used graffiti as marketing, and talked his way on to the sets of music videos. Eventually John built his company, FUBU, into a global brand. In 2009 he became one of the celebrity investors on "Shark Tank," which started a new chapter in his career. He's authored four books, invested in dozens of companies, and opened the coworking space blueprint + co. in Manhattan. His newest title, "Rise and Grind," profiles people who succeeded against the odds. The title of that book has taken on a new meaning for him recently. He spoke with Business Insider senior strategy reporter Richard Feloni.

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For a lot of her career, Erika Nardini worked at big companies: Microsoft, AOL, even Fidelity Investments. Then she took a risk by becoming CEO of Barstool Sports. Barstool is a comedy website known for the kinds of things guys talk about over beers: news, sports, and girls. On this episode of "Success! How I Did It," Nardini tells us what attracted her to a site some say is sexist, why as many as 8 million so-called "Stoolies" check out the site multiple times a day, and why she likes to text prospective hires on the weekend.

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Marc Lore's first big startup sold diapers, and it was bought by Amazon for more than $500 million. Instead of celebrating, Lore felt a let down. After Amazon, he went on to found a competitor, called Jet.com, which he recently sold to Walmart for $3 billion in cash, plus stock. This time, he's had a number of reasons to celebrate. Now he's the president and CEO of Walmart eCommerce in the U.S. The stock is way up. On this episode of "Success! How I Did It," Lore describes how he founded several companies with his childhood friends, and what made the Walmart deal different than Amazon's.

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