 Kuusi's interest in the study of proverbs has been continued by his daughter, Outi Lauhakangas.Among the scientific achievements of Matti Kuusi, one of the most influential has been the rough chronology he established for the various layers of Finnish epics, based on stylistic analysis, motifs and comparisons with Old Scandinavian and Russian epics.He is buried in the Hietaniemi Cemetery in Helsinki.