He also taught as a guest lecturer at the École normale supérieure in Paris and at the Université Laval in Quebec City.
He was one of the founders of the Swiss Musicological Society and long-serving editor-in-chief of the Revue musicale in Romansh-speaking Switzerland.
Eigeldinger's teaching interests focus on the history of esthetics and interpretation of the 18th and 19th centuries music.
Eigeldinger is also the editor of texts dealing with Chopin's work as a piano teacher.
Together with John Rink and Jim Samson, Eigeldinger is preparing a new critical edition of Chopin's entire oeuvre.