[3] In 2013 he gave four benefit performances in aid of Amnesty International of the monumental one-man play Clarence Darrow by David V. Rintels, based on the life of the lawyer and founding member of the American Civil Liberties Union, at the Teahouse Theatre in Vauxhall, London.
[6] Hoyt Hilsman, in reviewing the play for Back Stage West, wrote, "Shannon's memorable performance captures the soul of the late president like none other in recent memory.
[8] Los Angeles Times critic Philip Brandes wrote that "Shannon makes a heartbreakingly believable case for Harding's ignorance of and outrage at the abuses of his Cabinet.
[10] His play Liberty Rising is set in the Revolutionary War featuring George Washington and John Adams alongside their wives Martha and Abigail.
He and Turner met during the American season of Frith Banbury's production of the play The Day After The Fair by Frank Harvey,[12] which opened on September 4, 1973 at the Auditorium Theatre in Denver, Colorado and closed January 20, 1974 at the John F. Kennedy Center for the Performing Arts in Washington, D.C.[13][14] Shannon played the role of Bradford and Turner the role of Anna.