Upcoming: Fashion Designer Tim Gunn

He advises fashion-challenged people on his own show and on Bravo's Project Runway, which hits its fifth season July 16. He spent 23 years at Parsons design school and became Liz Claiborne's Chief Creative Officer in 2007. Submit questions for Tim Gunn

10 Questions for Neil deGrasse Tyson

A TIME 100 honoree, the director of New York City's Hayden Planetarium and the host of PBS's Nova Science Now, he's brought astrophysics down to earth. Neil deGrasse Tyson will now take your questions

10 Questions for Steve Carell

From The 40-Year-Old Virgin to The Office's clueless boss Michael Scott, he's made hilariously awkward comedy an art form. His new film, Get Smart, is in theaters. Steve Carell will now take your questions

10 Questions for Pete Sampras

The tennis legend, now retired, looks back on his life in the game--and his record 14 Grand Slam titles--in a new memoir, A Champion's Mind. Pete Sampras will now take your questions

10 Questions for David Sedaris

The best-selling author earned a devoted following for his sidesplitting essay collections. His latest, When You Are Engulfed in Flames, is out now. David Sedaris will now take your questions

10 Questions for Denis Leary

The fast-talking comic and star of the New York City firefighter drama Rescue Me appears in the new HBO film Recount, about the 2000 U.S. presidential election. Denis Leary will now take your questions

10 Questions for Howard Dean

As the final primaries approach, the Democratic National Committee chairman is at the center of the battle between Hillary Clinton and Barack Obama. Howard Dean will now take your questions

10 Questions for Toni Morrison

She's won the Pulitzer and Nobel prizes and recently received the PEN/Borders Literary Service Award. A new collection of her nonfiction, What Moves at the Margin, is out now. Toni Morrison will now take your questions

10 Questions for Maria Shriver

From career journalist to First Lady of California, this best-selling author and member of the Kennedy clan has written a new book, Just Who Will You Be? Maria Shriver will now take your questions

10 Questions for Newt Gingrich

He's been Speaker of the House, a professor and a best-selling author. His World War II novel, Days of Infamy, hits bookstores on April 29. Newt Gingrich will now take your questions

10 Questions for Rachael Ray

The perky Food Network host's empire includes a magazine, a talk show and a nonprofit group. Her latest book, Yum-O! The Family Cookbook, comes out April 29. Rachael Ray will now take your questions

10 Questions for Randy Pausch

He's a Carnegie Mellon professor with terminal cancer. His stirring final speech became an Internet sensation and the basis for a new book, The Last Lecture. Randy Pausch will now take your questions