Jerek performs the roles of La théière,

Le petit vieillard and La rainette in L'enfant et les sortilèges, the role of Clergy in Offenbach's Songbird, and understudy the roles of Nemorino in L'elisir d'amore and Rodolfo in La Bohème. Jerek is also a featured soloist on various concerts.

Jerek performed the roles of Don Octavio and in abridged productions of Don Giovanni and Le nozze di Figaro. Jerek was also a featured soloist on varios concerts.

Jerek covered the role of Un officier in Thérèse. Jerek was also a featured soloist on varios concerts.