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Associated Press
Republican presidential nominee Mitt Romney and his vice presidential running mate Rep. Paul Ryan, R-Wis. wave to their supporters after posing a group picture with their campaign staff at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012.

(In order of appearance, beginning around 5 p.m. MDT)

Newt and Callista Gingrich

Newt and Callista Gingrich are slated to speak at the Republican National Convention following a video tribute to Ronald Reagan. "Callista and I will talk about applying the principles of Ronald Reagan to 2012," Gingrich told CNN Monday. Gingrich formerly challenged Romney for the Republican presidential nomination. He served in the U.S. House of Representatives from 1979 through 1999, helping to create the "Contract with America," and serving as Speaker of the House. Gingrich and his wife host and produce historical and public policy documentaries, including the documentary, "Ronald Reagan: Rendezvous with Destiny."

Craig Romney

The youngest of the five Romney sons, Craig Romney was born in 1981, is married to Mary and has two children, according to Buzzfeed. Romney graduated from high school in 1999 and left to serve an LDS mission in Chile in 2000. Romney graduated from Brigham Young University and previously worked as an advertising music producer at McGarry Bowen before moving into real estate. His speech at the convention is meant to help present a picture of Mitt Romney the man, or, as Tagg Romney told Politico, "We're his character witnesses."

Former Gov. Jeb Bush

Although former president George W. Bush won't be appearing at the Republican convention, his brother Jeb Bush will. Bush was the 43rd governor of Florida, serving from 1999 through 2006. In June, Bush came under fire from conservatives after saying that Ronald Reagan and George H.W. Bush would have a "hard time" fitting in during the tea party era. Bush endorsed Romney in March. According to The Hill, Bush's speech will criticize President Barack Obama for blaming the country's woes on George W. Bush, and will also touch on education.

Staples Inc. Co-founder Tom Stemberg

Before Staples opened its first store, company founder Thomas G. Stemberg went to Bain and told Romney that employees were spending more on office supplies than they thought. Romney conducted a survey and agreed to put $650,000 into the venture. Within a few years, he made back eight times his money, The Week reports. A Newsmax article states that Bain employees helped stock Staples' first store in Brighton, Mass., in 1986. Stemberg told Parade that Romney even gave a speech before the opening of the first store on May 1, 1986.

Jane Edmonds, former Massachusetts Secretary of Workforce

Jane Edmonds is a self-described liberal Democrat and an African-American civil rights activist from Massachusetts, Politico reports. But more than that, she's Mitt Romney's friend. "I adore the guy," Edmonds told Politico. "I have seen him behind closed doors in Cabinet meetings. I have seen his compassion. I'm at a point in my life that the character of the human being we entrust to be president is important to me. He would make an excellent president."

"To Be Announced" (Clint Eastwood)

A Republican National Convention schedule released Monday left one prime speaking slot filled with "To Be Announced," sparking rumors that actor Clint Eastwood will be bringing a bit of Hollywood to the final night of the convention. Eastwood is known for TV and film roles in shows such as "Rawhide," "The Good, the Bad and the Ugly," "Dirty Harry," "Million Dollar Baby," "Unforgiven" and "Gran Torino." He has also worked as a director for films like "Mystic River," "Flag of our Fathers" and "Letters from Iwo Jima." Eastwood was elected mayor of Carmel, Calif., in 1986. He endorsed Romney in August.

Marco Rubio

Sen. Marco Rubio from Florida was elected to the Senate in 2010, is counted as a rising Republican star and was floated as a possible VP pick for Romney. Rubio's parents left Cuba in 1956 and Rubio was born in Miami. His parents, he says, taught him about self-sufficiency and hard work. Rubio has criticized President Obama, saying the president doesn't believe in the American free enterprise system.

Mitt Romney

Mitt Romney, the former Governor of Massachusetts, is on the verge of becoming the Republican Party's official 2012 presidential nominee following a long primary battle. Romney was born in 1947 in Detroit, and attended Stanford University, Brigham Young University and Harvard University. He married Ann Davies in 1969 and together they have five sons — Taggart, Matt, Josh, Ben and Craig. Romney is a member of The Church of Jesus Christ of Latter-day Saints, served a mission in France and served as a bishop and stake president in the Boston area. He will be the first Mormon presidential nominee of a major political party. It is expected that Romney will open up about his Mormon faith as he accepts the nomination Thursday.