Caryn Mathes is the general manager of American University’s radio station, WAMU 88.5 FM. Since she arrived in March 2005, WAMU’s audience has increased by 1,000 people, or 3 percent. She has also been instrumental in bringing new donors to WAMU. Before coming to WAMU, Mathes was general manger for WDET-FM in Detroit for 21 years and news director for two years.

What is the biggest challenge facing radio?