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As a former stockbroker and hedge-fund manager, co-founder of financial web site TheStreet.com and high-energy host of CNBC's Mad Money, Jim Cramer has given his fair share of advice on everything from soaring stocks to failing banks. He's had his share of good calls and bad — notably predicting the market meltdown a year before it happened and saying that Bear Stearns was a buy just a day before its collapse — and starred in this year's most provocative media feud opposite Daily Show host Jon Stewart. Submit your questions for Jim Cramer below, then read the interview in an upcoming issue of TIME magazine.

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J.J. Abrams has done it all—writing, producing and directing for television and movies. His hit shows such as Alias, Lost, and Fringe have earned him a tremendous following that makes his trips to the box office that much more profitable. A viral marketing campaign made 2008's Cloverfield a smash; this time at the multiplex, Abrams is rebooting one of TV's most popular franchises. The feature film Star Trek hits theaters May 8, making it the 11th movie based on the TV show. Submit your questions for J.J. Abrams below, then read the interview in an upcoming issue of TIME magazine.

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Her years of battling Liberia's corrupt leadership earned her forced exile, charges of treason and the affectionate nickname the “Iron Lady”. She has been Africa director of the United Nations Development Programme and an economist for the World Bank. Following the ouster of Liberian President Charles Taylor and a peace accord with the nation's restive rebel groups, she stood for office in Liberia's landmark 2005 elections and was voted in as Africa's first elected female President. Her memoir This Child Will Be Great is available now. Submit your questions for President Ellen Johnson Sirleaf below, then read the interview in an upcoming issue of TIME magazine.

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Her career is all about the numbers. She's the first U.S. swimmer to compete in five Olympic Games. She has won twelve Olympic medals (four gold, four silver, four bronze) and in 2007 broke her own American record in the 50m freestyle, 26 years after she first set it at age 15. And she did all of this in her 40s -- virtually unheard of in any sport. Her new book Age Is Just a Number, available now, argues that dreams are achievable at any stage of life. Submit your questions for Dara Torres here, then read the interview in an upcoming issue of TIME magazine.

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He's played the precocious yuppie Alex P. Keaton on the 1980s TV show Family Ties, a time-traveling teenager in the Back to the Future trilogy and a wheeling-and-dealing deputy mayor in the hit sitcom Spin City. Since being diagnosed with Parkinson's, a degenerative disease of the nervous system, in 1991, Michael J. Fox has become a tireless advocate for stem-cell research to find a cure. His second memoir, Always Looking Up: The Adventures of an Incurable Optimist is on stands now. Submit your questions for Michael J. Fox here, then read the interview in an upcoming issue of TIME magazine.

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The 19-year-old singer-songwriter parlayed her knack for catchy tunes and thoughtful lyrics into more than 4 million albums sold last year - making her 2008's best-selling artist in the U.S. With a hit album, Fearless and a first-ever headlining tour kicking off April 23 in Evansville, Indiana, she seems poised for a rise to country music royalty. Submit your questions for Taylor Swift here, then read the interview in an upcoming issue of TIME magazine.

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She honed her comedic chops at the Upright Citizens Brigade and went on to seven seasons on Saturday Night Live, where she parodied everyone from Dakota Fanning to Hillary Clinton and famously performed a rap about Sarah Palin last fall while nine months pregnant. She's now starring in her own NBC television show, Parks and Recreation, from the executive producers of The Office, premiering April 9. (And yes, she gave birth Oct. 25 -- it's a boy.) Submit your questions for Amy Poehler here, then read the interview in an upcoming issue of TIME magazine.

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In a career spanning nearly 40 years, Jackie Chan has shown off his kung fu finesse, slapstick humor and singing chops. He earned a loyal following with Hong Kong classics like Drunken Master and Police Story before taking his action-comedy to Hollywood with box office hits Rush Hour and Shanghai Noon. In the dark thriller Shinjuku Incident, Chan tests his dramatic skills as an illegal Chinese immigrant in Japan who gets mixed up with local gangsters. Submit your questions for Jackie Chan here, then read the interview in an upcoming issue of TIME magazine.

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Late last year, when Detroit's Big Three petitioned the federal government for a bailout amid major losses, Ford Motor Company was the only automaker not to take a handout. While Ford is far from healthy -- it lost $14.6 billion last year -- its robustness compared to competitors General Motors and Chrysler is largely thanks to Mulally, who joined Ford from Boeing in 2006. The 30-year veteran of the aviation industry has reformed Ford's corporate culture, struck an important agreement with auto workers' unions and managed to stay optimistic amid the worst environment ever for the U.S. car industry. Most recently, his company unveiled a redesign of the company's flagship Ford Taurus and announced plans to release an all-electric van next year. Submit your questions for Alan Mulally below, then look for the interview in an upcoming issue of TIME magazine.

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A longtime Bollywood icon, he has composed some of the most stunning film music ever recorded. Now, his work is going global: the chart-topping soundtrack for Slumdog Millionaire, which won Oscars for best original score and best original song, has made him an instant hit with Western audiences. Submit your questions for A.R. Rahman below, then look for the interview in an upcoming issue of TIME magazine.