Bert Willemsen was born on November 22, 1973 in Haarlem and studied HaFaBra conducting with Jan Schut (Bachelor's degree, 1997) and Classical Trombone with Jaap Dekker (Teaching musician, 1999) at the conservatory of the Alkmaar University of Applied Sciences.

In 2013, Bert obtained his Master's degree in HaFaBra conducting at the Royal Conservatory of The Hague with Alex Schillings.
As a low brass teacher, he was associated with the Opmeer Music and Dance School for many years.