William Plummer is the associate professor and director of choral activities at the University of Louisiana, where he conducts the Louisiana Chamber Singers, the Ragin' Cajun Soprano/Alto Choir, and the Louisiana Tenor/Bass Chorale.

The Louisiana Chamber Singers (the top vocal ensemble at Louisiana) have risen to international acclaim, winning the International Choral Festival Wales with the highest score achieved by any choir, and attaining the Gold Award in 2021. Recordings by the Louisiana Chamber Singers have received airplay in the United Kingdom on Outreach Radio, and the ensemble was invited to perform for the Belgian parliament in Namur in 2022.