Best known as the host of the hit TV show, Jack Hanna's Animal Adventures, Jack Hanna, nicknamed "Jungle Jack", is instantly recognized by his khaki safari outfit, deep tan and Southern twang. He has appeared on shows such as Good Morning American, David Letterman and Larry King Live and has boosted the popularity of zoos.

Tony award-winning and five-time Emmy nominated TV, cinema and musical theatre comedic actor, Jason Alexander is best known for his role as George Costanza on the hit show, Seinfeld. He has appeared in numerous TV ads including Rold Gold Pretzels, McDonald's and KFC.

One of television's most versatile reports and the longest-running co-host of Good Morning America, Joan Lunden is viewed as the consummate working mother and has continually surprised her audience. She is author of A Bend In The Road Is Not The End Of The Road and Wake Up Calls: Making the Most Out of Every Day.

Owner of the NBA basketball team, Dallas Mavericks, and Chairman and co-founder of HD Net, an HDTV cable network, Mark Cuban was ranked #133 on Forbes' "World's Richest People" list in 2007. He works with 2929 Entertainment which provides vertically integrated production and distribution of films and videos.

Paul Kangas was dubbed by The Detroit Free Press as "the Walter Cronkite of business broadcasting." A former stockbroker with more than 12 years experience, he is now the co-anchor and financial commentator for public television's Nightly Business Report and television's leading provider of daily stock market information.

Tavis Smiley was selected by Time magazine as one of America's 50 most promising young leaders. Newsweek profiled him as one of the "20 people changing how Americans get their news" and dubbed him one of the nation's "captains of the airwaves". He was the first American to simultaneously host signature talk shows on both PBS and NPR.

For more than 25 years Barbara Walters has been co-host of ABC's 20/20 and one of the most highly acclaimed and respected television journalists, writers and media personalities in America. Her speech offers insights into the minds and personalities of some of the most famous people she's interviewed.

Credited with creating "the last refuge of intelligent conversation on television," Rose and his popular PBS program illuminate the personalities and events that define our society. Also a correspondent for 60 Minutes II, he brings his relentless curiosity and penetrating insight to the podium as the ideal moderator or insightful commentator on politics and culture.

One of the earliest pop culture bloggers, founding PopandPolitics.com in 1995, Farai Chideya is a novelist, journalist and radio host of News & Notes on NPR. Her first novel, Kiss the Sky, is due May 2009. She has worked for Newsweek magazine, MTV News, CNN, ABC and the Oxygen Network.

Bob Schieffer has been with CBS News since 1969, serving 23 years as anchor on the Saturday edition of CBS Evening News. He is one of few journalists to have covered all four of the major Washington national assignments. Most recently he has acted as the moderator of the 2008 presidential debate between Senator Barack Obama and Senator John McCain.