The United States is home to more billionaires than any other nation, according to research firm Wealth-X – but not all of them were born in the US. Several billionaires – including Tesla CEO Elon Musk, real estate developer Jorge Pérez, Panda Express founders Peggy and Andrew Cherng and Chobani founder Hamdi Ulukaya – first came to the US for further education. Others immigrated earlier with their families as children. Keep reading to learn more about some of the most prominent billionaires in America who were born outside the country. How Facebook’s Sheryl Sandberg became tech’s top woman Sergey Brin’s family emigrated from the Soviet Union when he was six Net worth: US$57.5 billion Source of wealth: Alphabet The 46-year-old billionaire founded the search engine now known as Google with Larry Page, in a garage in Menlo Park, California. Brin currently serves as the president of Alphabet, the parent company that owns Google. Hamdi Ulukaya founded the yogurt brand Chobani after emigrating from Turkey to attend college in New York Net worth: US$2.1 billion Source of wealth: Chobani Ulukaya, 46, received a US$3,000 loan from the Small Business Administration in 2007 and used it to buy an old yogurt plant in Norwich, New York. Chobani now sells more than US$1 billion of yogurt annually and is America's most popular brand of Greek yogurt, Forbes reports. Ulukaya now advocates for companies to get involved in the ongoing refugee crisis, Bloomberg reported in August. Chobani recruits refugees for jobs at its plants and encourages other companies to do the same. How did Forever 21’s owners lose their billionaire status? Financier George Soros fled Soviet occupation in his native Hungary in 1947 Net worth: US$8.3 billion Source of wealth: Quantum Fund Soros, 89, attended the London School of Economics before moving to New York and getting a job as a stock trader. Soros went on to found what would later become the world's largest hedge fund, Quantum Fund. Eren Ozmen, the president of aerospace company Sierra Nevada Corporation, immigrated to the US from Turkey Net worth: US$1.4 billion Source of wealth: Sierra Nevada Corp Ozmen, 61, and her husband used their house as collateral to purchase Sierra Nevada Corporation in 1994. Ozmen grew the 20-person company into one of the federal government's largest contractors, having sold billions of dollars of planes, navigation gear and communications systems to the US Department of Defense. How will Isha and Akash Ambani celebrate their 28th birthday? Miami real estate developer Jorge Pérez was born in Buenos Aires, Argentina Net worth: US$1.9 billion Source of wealth: The Related Group Perez, 70, moved to the US for college, and later worked as an urban planner before partnering with Stephen Ross to launch Miami-based luxury real estate developer The Related Group. Bharat Desai, the founder of IT consulting firm Syntel, was born in Kenya and raised in India Net worth: US$1.4 billion Source of wealth: Syntel Inc Desai, 66, came to the US to work for Tata Consultancy Services. He and his wife, Neerja Sethi, then started their own consulting company, Syntel, in their suburban Detroit apartment with just US$2,000. Early Google investor Kavitark Ram Shriram was born and raised in India Net worth: US$2.2 billion Source of wealth: Venture capital Shriram, 62, serves on Alphabet's board and holds stakes in numerous tech start-ups (including Paperless Post) through his venture capital firm Sherpalo Ventures. Panda Express founders Peggy and Andrew Cherng immigrated to the US from Myanmar and China respectively, before meeting as students at Baker University Collective net worth: US$3.1 billion Source of wealth: Panda Express Andrew Cherng opened a sit-down Chinese restaurant called Panda Inn in 1973 that proved so successful he decided to open an outpost in a nearby mall called Panda Express. The couple still owns and operates virtually all 2,000 Panda Express locations themselves – they don't franchise them out to other owners, making Panda Express a rarity among restaurant chains of its size. Who are the heirs to the Bezos, Gates and Ambani fortunes? WhatsApp co-founder Jan Koum immigrated to California from Ukraine with his mother when he was 16 Net worth: US$10.9 billion Source of wealth: WhatsApp Koum, 43, founded the messaging service with seed money he raised from his former colleagues at Yahoo, according to the Bloomberg Billionaires Index. Most of Koum's fortune comes from Facebook's US$22 billion acquisition of WhatsApp in 2014. Pierre Omidyar moved to the US from France with his family long before he founded eBay Net worth: US$12.6 billion Source of wealth: eBay Omidyar, 52, founded eBay in 1995 and wrote the code for the website himself, according to Forbes . Omidyar still serves on the board of the online auction house. How space travel dreams sparked Jeff Bezos’ feud with Elon Musk Tesla CEO Elon Musk grew up in South Africa and worked in Canada before coming to the US Net worth: US$20.7 billion Source of wealth: PayPal, Tesla Iconic entrepreneur Musk, 48, first moved to the US to attend the University of Pennsylvania. The CEO founded a city guide service for newspapers called Zip2 and an online banking platform named X.com that was acquired by PayPal. He later founded SpaceX and co-founded Tesla, taking the top job of CEO. Want more stories like this? Sign up here . Follow STYLE on Facebook , Instagram , YouTube and Twitter . This article originally appeared on Business Insider .