Terry Gross

Underhill studies and tracks the habits of shoppers in order to learn the best way to lead them to make purchases. His retail consulting firm, Envirosell, has helped big-name companies such as McDonald's, Levi Strauss and Blockbuster to study their customers' browsing and buying habits. He's the author of the book Why We Buy, and the new book Call of the Mall.

Carley is the executive director of GRASP, The Global and Regional Asperger Syndrome Partnership. In 2000, he and his then 4-year-old son were diagnosed with Asperger's Syndrome. GRASP works to educate the public about the disorder.

Volkmar is a leading researcher in Asperger's Syndrome, generally considered to be a form of autism characterized by deficits in social interaction and non-verbal communication. In the early 1990s, Volkmar led the team that helped develop the definition of autism used by the American Psychiatric Assoc. He is the Irving B. Harris Professor of Child Psychiatry, Pediatrics and Psychology at the Yale University Child Study Center.

Edwards, former host of NPR's Morning Edition, was reassigned just last week and is now a senior correspondent for NPR. He is the author of the new book Edward R. Murrow and the Birth of Broadcast Journalism. Edwards is also the author of Fridays with Red, about his radio friendship with legendary sportscaster Red Barber.

Her book Eats, Shoots & Leaves, a best seller in Britain, is a narrative history of punctuation. Truss claims that with the advent of e-mail and text messaging, proper punctuation is an endangered species. Truss is also the author of three novels and numerous radio comedy dramas. She has been a television critic and sports columnist for The Times (London). She also won Columnist of the Year award for her work for Women's Journal. She now reviews books for the Sunday Times of London.

While The Washington Post's bureau chief in West Africa in 2001, Douglas Farah discovered al-Qaeda's diamond smuggling operations there. His coverage for the Post angered his hosts in West Africa and embarrassed U.S. intelligence officials. Forced to leave Africa and to defend his findings back in the United States, Farah continued his investigation. He's just published a book, Blood from Stones: The Secret Financial Network of Terror, that details his findings.

Producer Raney Aronson is the producer, writer and director of the new PBS Frontline documentary, The Jesus Factor (April 29, at 9 p.m. on many stations). It examines President Bush's evangelical Christian faith, how he became a born-again Christian and the impact it has on his politics. Also, Wayne Slater, Austin bureau chief of The Dallas Morning News. He's followed Bush's political career, and appears in the documentary. He is also the author of the book, Bush's Brain: How Karl Rove Made George W. Bush President.

Land is president of the Southern Baptist Convention’s Ethics and Religious Liberty Commission. He and President Bush share the same evangelical faith.

She wrote the screenplay for the new movie Mean Girls. It's based on the book, Queen Bees and Wannabes, by Rosalind Wiseman. Fey also co-stars in the film, along with Lindsay Lohan, Tim Meadows, Amy Poehler and Ana Gasteyer. Fey is co-head writer and writing supervisor for Saturday Night Live. She is the show's first female head writer. She also co-hosts SNL's Weekend Update. She and the writing staff won an Emmy Award for their work in 2002. Before SNL, Fey wrote and performed for the famed Second City in Chicago.

He died Monday at the age of 75. In 1964, his book Last Exit To Brooklyn, shocked readers with its salty language and explicit portrayal of prostitutes, thugs, ex-cons and striking dock workers along the Brooklyn waterfront in the 1950s. Selby's other books included The Room, Requiem for a Dream, The Willow Tree and Waiting Period. (This interview was originally broadcast on May 4, 1990.)