In 1951, Hackenschmied and Gian Carlo Menotti co-directed the film version of Menotti's opera The Medium.
In February 2011, The Medium by Gian Carlo Menotti, a Second Movement production first staged in 2006, was performed in a tour of Northern Ireland by NI Opera in association with Second Movement, with performances in the Strule Arts Centre, Omagh; The Great Hall, Downpatrick; Theatre at the Mill, Newtownabbey and The Market Place Theatre, Armagh.
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With the company she also created the part of the music teacher in the world premiere of Gian Carlo Menotti's Help, Help, the Globolinks! in 1968.
He soon turned to directing, working for a time at the Royal Dramatic Theatre and then at the Royal Swedish Opera, where his more notable productions included Gian Carlo Menotti's The Consul and Karl-Birger Blomdahl's Aniara.
At that same opera house he notably created the role of The Chief of Police in the world premiere of Gian Carlo Menotti's Amelia Goes to the Ball and portrayed the Father-In-Law in the United States premiere of Darius Milhaud's Le pauvre matelot which were performed in a double bill on 1 April 1937.
The company has also had the privilege of being supported in benefit concerts or performances by such individuals as Tony Randall, Paul Sorvino, Luciano Pavarotti, Samuel Ramey, Gian Carlo Menotti, and Mirella Freni, among others.
With the NBCOT she notably created the role of Agata in the world premiere of Gian Carlo Menotti's Maria Golovin at the Expo '58 in Brussels on August 20, 1958; later the same year she portrayed the role on Broadway. For the NBC, she also created the role of Arina in the premiere of Bohuslav Martinů's The Marriage.
Composed in 1955, the opera premiered on June 20, 1958 at the very first Festival dei Due Mondi in Spoleto, Italy in a production produced by Gian Carlo Menotti and conducted by Reinhard Peters.
According to the professor, writer, and opera scholar John Louis DiGaetani, Schippers had a lengthy romantic relationship with the composer Gian Carlo Menotti, in addition to a shorter romantic relationship with mathematician Sean Clarke.
In 1966, she appeared as Anna Gomez in a production of Gian Carlo Menotti's The Consul at New York City Opera.