For the past 13 years, Charles Friedrichs has been a Lecturer of Music at San Diego State University. He currently is the Associate Director of Bands and the Assistant Director of Music Education. During his tenure at SDSU, he has taught a wide variety of classes including music theory, brass methods, music education practicum, music for classroom teachers, brass literature, ear training, general education music courses, as well as serving as a Music Supervisor for cadet teachers in SDSU's School of Education. In addition to his classroom duties, he conducts two concert bands, the University Pep Band, and co-conducts the Marching Aztecs.

Charles has had vast experience teaching school instrumental music at all levels and continues to remain extremely active in the public schools. He is in demand as a concert and marching band clinician and adjudicator. When his schedule permits, he continues to go out to the public schools and teach Jr. High Band. Recently, he was the long-term guest clinician at Bernardo Heights Middle School, Poway Unified School District.

Charles is also busy as an arranger. He has written numerous arrangements spanning grade levels from elementary to university. Many of his arrangements are for concert bands and marching bands. His compositions have been published by Hal Leonard Music Corporation and MESA Music Publishers.