Senator's oratorio Holocaust Requiem was premiered at Canterbury Cathedral in 1986, under the aegis of the United Nations, the International Council of Christians and Jews, the Government of Germany, and the B'nai Brith.
It has since been performed in many places worldwide, including the U.S. (Tillis Center, 1988; Manhattan, 1990); Moscow, 1993; Czechoslovakia (Terezin 1995); Rome (1991, one month after the 9/11 attacks, Un Concerto per la Pace).
Senator composed six operas and musicals on texts by modern authors including Anthony Burgess, Peter Porter, and Ursula Vaughan Williams.
Senator's work as an author includes his Requiem Letters, described by Publishers Weekly as "a deeply moving and haunting autobiographical memoir".
This was developed in a programme at London University sponsored by the British Social Science Research Council, and involved teachers at every level of education.