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.
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Guest conductors were engaged for the 1953-1955 seasons (in lieu of a regular conductor) including Carlos Chávez, Enrique Jordá, Dimitri Mitropoulos Thomas Schippers, Boris Sirpo, Russell Stanger, and Igor Stravinsky.
Puccini - La bohème - Mirella Freni, Nicolai Gedda, Mariella Adani - Rome Opera Chorus and Orchestra, Thomas Schippers - EMI - (1963)