In a day and age where many radio programs rely on the powers of mere shock value, Extension 720 offers discerning and insightful commentary on a very wide range of issues. Based out of Chicago, the program is hosted by Milt Rosenberg, who is a professor emeritus at the University of Chicago. Since 1973, the program has featured the likes of Margaret Thatcher, Jimmy Carter, Charlton Heston, William Safire, and Calvin Trillin, among others. On the site, visitors can listen to the current program, or browse through the extensive archives, which date back to 2003. Additionally, visitors can also view highlights of interviews from the 1970s, 1980s, and 1990s. Some of the more recent programs have focused their attention on the world of stand-up comedy, organized crime in Chicago, and the current state of various Great Books curricula in American high schools and colleges.