 He served two terms on the board of directors of the Austin Writers' League, now the Writers' League of Texas, one as Secretary of the Board, and three years on the board of directors of the Austin Celtic Association, two as President.He was festival director of the Austin Celtic Festival for those same two years.Shannon appeared as an extra in the films "The Newton Boys" by Richard Linklater, and "Two for Texas", a Ted Turner "made for tv" movie from 1989.