Premise: Wallace Michael Ross (19 September 1920 – 20 January 2010) was the founder of the Derby Bach Choir. He was also the Master of Music at Derby Cathedral, assistant organist at several great English Cathedrals, teacher of languages and music at several schools including Sturgess School in Derby. He also founded the Derby Cathedral Brass Ensemble and the Derby Sinfonia.
Hypothesis: Wallace Michael Ross retired as a teacher.