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 positions at the National Bureau of Standards as a 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.