Since he showed serious provisions for musical composition, he followed his earlier training with lessons from Émile Pessard, a professor at the Conservatoire de Paris.
The creation of Messaouda, a one-act opéra comique written with Davin de Champclos and Andre Mauprey, was incredibly successful and received with great praise when it premiered at the Théâtre Moncey in Paris.
Romanitza, a lyrical drama in four acts on a poem by Maurice Magre, was also presented with great success in April 1913 at the Théâtre Municipal of Calais.
He had also travelled to places including Canada, Cuba (where he directed the National Philharmonic Orchestra for some time), although finally arriving in Broadway in 1929–1930.
In 1926 Maurice, along with Ernö Rapée, Frederick Stahlberg (for a short-time), and Charles Previn, was appointed as music staff at the newly opened Roxy Theatre.
[3] In the same year, he took part in the Federation of French Veterans of the Great War Inc, Grand Concert and Annual Ball held at the Hotel Plaza in New York alongside other musician and performers like Lucienne Boyer, Doris Niles, Leon Rothier, M. Van De Putte, and Raymonde Delaunois.