Along with Underworld, one of his novels centers on a colleague of Murray Jay Siskind, who is addicted to Dylar.  
He wrote about a rock star whose tempted by Azarian and Dr. Pepper, and is later chased by the evil organization, "The Happy Valley Farm Commune." That character, Bucky Wunderlick appears in Great Jones Street, while Keith Neudecker barely escapes the destruction of the Twin Towers in Falling Man, and the prologue "Pafko at the Wall" about the 1951 National League Pennant starts a novel focusing on Nick Shay. Along with Underworld, one of his novels centers on a colleague of Murray Jay Siskind, who is addicted to Dylar.  For 10 points, name this American author, who wrote about Professor of Hitler Studies, Jack Gladney in White Noise.
He wrote about a rock star whose tempted by Azarian and Dr. Pepper, and is later chased by the evil organization, "The Happy Valley Farm Commune.
Don DeLillo