From Fox News:
Peterffy -- though not as prominent as perhaps the most famous Hungarian-born billionaire, George Soros -- is the founder of Interactive Brokers and one of the richest people in this country. Forbes lists his net worth at $4.6 billion. He's contributed freely over the years to mostly Republican candidates, including to Romney in his last two presidential campaigns. And he gave more than $60,000 to the Republican National Committee last year.
Born in Hungary in 1944, Peterffy left for the United States in 1965. In America, he learned English and eventually launched Interactive Brokers in 1993. He lives in Greenwich, Conn.