[1] His teachers were Emil Frey (at the Zürich Conservatory) and Volkmar Andreae.
He then continued his studies for two years intensively with Artur Schnabel in Berlin and began his performing career in 1934.
He became famous as an interpreter of Ludwig van Beethoven, Franz Schubert, Robert Schumann and Johannes Brahms.
Aeschbacher also performed and left recordings of works by Othmar Schoeck, Arthur Honegger, Heinrich Sutermeister and Walter Lang.
Aeschbacher's notable students included Anna Renfer and Peter Schmalfuss.