Rassenfosse was appointed Secretary of the Section of Fine Arts as part of the Liège International Expo 1905, and a member of the administrative committee of the Liege Academy of Fine Arts. He participated in several international exhibitions in 1906. When Bénard died in 1907 he had to undertake greater responsibilities with the printing house, leaving him less time for artistic work, leading to a temporary period of stagnation. The death of his son in 1913 and the rigors of World War I caused another crisis. In response he locked himself away for days at a time, absorbed in his work.