From 1907-1948 Dellinger worked at the National Bureau of Standards as physicist; chief, radio section; and chief, Central Radio Propagation Laboratory. From 1928-1929 he served as chief engineer of the Federal Radio Commission, and also served as a representative of the United States Department of Commerce on the Radio Advisory Committee (1922–1948).
From 1907-1948, Dellinger held various positions at the National Bureau of Standards, including physicist, chief of the radio section, and chief of the Central Radio Propagation Laboratory. He also served as chief engineer for the Federal Radio Commission from 1928 to 1929 and was a representative of the United States Department of Commerce on the Radio Advisory Committee from 1922 to 1948.