Assistant chemist, 1887-1893, chemist, 1893-1895, director, 1895-1933, Lawrence (Massachusetts) Experimental Station. Chief chemist Massachusetts State Board Health, 1897-1933. Chemist Metropolitan Sewerage Commission, 1898, Charles River Dam Commission, 1901, Massachusetts Highway Commission, 1908-1921.
Lecturer on sanitary engineering, Harvard, 1925. Engaged in sanitary engineering practice since 1933. Consulting expert in regard to purification of water and disposal and purification of sewage and industrial wastes of many cities, bds. and corporations.