sentences:  He studied voice with tenor Walter Carringer, choral music with Margaret Hillis, and opera with Robert Gay, a disciple of Boris Goldovsky.He participated in the 1974 American premiere of Sir Michael Tippett's "The Knot Garden" at Northwestern, singing the role of Mangus.In 1979, Kraus made his professional debut singing the role of the Vicar in Benjamin Britten's "Albert Herring" with the Chicago Opera Theater.