Active in professional associations, Armsby served as the first president of the American Society of Animal Production (1908–1911), president the Association of American Agricultural Colleges and Experiment Stations (1899), and president of the Society for the Promotion of Agricultural Science (1905–1907). He served on the editorial committee of the Journal of Agricultural Research (1914–1919). He also served on the Inter-Allied Scientific Food Commission during World War I.[10]