He worked some years in Cologne and Marburg inside Germany, and militated rapidly in order that paediatrics integrate medicine progress and social education of young mothers.
[1] After the Allies victory in 1918, he became the first Professor of Paediatrics at the French Medicine College of Strasbourg, which became part of France again after the war.
The impacts of the work of this association were so huge that in 1945, more were created in France, on this model, the "National Mother and Childhood Protection" (also known as PMI (in French)).
Rohmer was a pioneer in research into prematurity, poliomyelitis, tuberculosis, osteomalacia and vitamin C. He was the director of the paediatric clinic of Strasbourg until his retirement in 1947, and made it famous all around Europe.
In 1946, he wrote with Robert Debré a famous manual entitled "Traité de Pathologie Infantile" (2,500 pages, two volumes) which became a reference for a whole generation of paediatricians.