Nominated for ten Emmy Awards, she won the award in 2001 for her work on the animated series Batman Beyond. In 1991, with the help of composer Shirley Walker, Ritmanis began her career as a film and television composer. Her collaboration with Ms. Walker provided an opportunity for her to write music for Batman: The Animated Series at Warner Bros. Studios. She continued at Warner Bros. with work on Superman: The Animated Series and Batman Beyond. During this period of time, Ritmanis met and began a professional collaboration with composers Michael McCuistion and Kristopher Carter. The trio went on to compose music for The Zeta Project, Teen Titans, Justice League, Justice League Unlimited, Legion of Super Heroes, and several long form projects.