In much of Marc Gagnon's photographic artwork features historical events in time that are significant. Gagnon believes that we as a society should not forget our roots, the contributions of others in the past, not to forget our mistakes so that they are repeated as well as what makes us as a society. Some of Gagnon's work as involved the Founding Fathers of America, Biblical themes, as well as other significant events as The Holocaust, The Civil War, the Discovery of Christopher Columbus, historical contributors of literature, and that of which is most important to him, the Space Shuttle Challenger.