Significant teachers and mentors:
Some of Ms. Grannemann's teachers over the years who were most influential included her instructors from both Drake University, and Central Methodist University, such as: James Hess, Glenna Hess, Andrew White, and Hermanus Baer.
Professional affiliations & activities:
Mary Ann also has professional affiliations with several high school located in Illinois. She has extensive experience teaching singers of all ages, and was a former voice instructor at New Trier West, Mundelein High School, Elk Grove High School, Prospect High School, and Regina High School. She is currently a voice instructor at New Trier High School.