Dennis Spragg is a music historian and author who has become an expert on the bandleader Glenn Miller. He is the senior consultant for the Glenn Miller Archives and the American Music Research Center at the University of Colorado Boulder, as well as the historian for the Glenn Miller Birthplace Society in Clarinda, Iowa. These collections include donations from artists, their families, producers, broadcasters, and collectors. The entire scope of the big-band era is represented, including over 10,000 recordings and broadcasts, many of which are unique.