David, from St. Louis, Missouri, is an arranger and composer of vocal music. He specializes in vocal harmony, especially barbershop harmony, but his work often integrates the close harmony style with jazz, blues, gospel, country, doo-wop, and contemporary a cappella. He is musical advisor and two-time former director for the St. Charles Ambassadors of Harmony, a 160-voice male chorus which won the Barbershop Harmony Society's International Chorus Contest in 2004 and the silver medal in 2007. David is musical consultant and arranger for the ten-time international champion Dallas Vocal Majority, as well as for the international champion quartets Ambiance (now retired), Gas House Gang, Nightlife, Revival, Michigan Jake, Four Voices, Gotcha, and Vocal Spectrum. He has researched the origins of barbershop harmony and teaches a course on the history of the barbershop style at the Barbershop Harmony Society's Harmony College.
Professionally, David is a mathematician. He received his Ph.D. in Mathematics from Columbia University, New York City, and is now a Professor and Chair of the Department of Mathematics at Washington University in St. Louis. As a researcher he has been an invited speaker at a number of international mathematics conferences. Visit David's Mathematics Web Site