 As well as giving a good many concerts, both in France and in other countries (England, Australia, the United States), Marchal taught organ at the Institut National des Jeunes Aveugles in Paris, in addition to serving as titular organist of the Abbey of Saint-Germain-des-Prés (1915–1945) and Saint-Eustache (1945–1963).From the latter post he resigned in 1963, his departure being brought about over a conflict concerning the correct organ builder to be hired to restore Saint-Eustache's instrument.He was an unparalleled improviser and was recognized as such by Fauré.