Heppner made his American debut as Walther von der Vogelweide in Tannh‹user at the Lyric Opera of Chicago in 1988; in 1992 he sang the title role of William Bolcolm's McTeague in its world premiere there. He first sang Lohengrin in 1989, Peter Grimes in 1994, Andrea Ch_nier in 1996, Tristan in 1997, and Aeneas in Berlioz's Les Troyens in 2000.