In office of town engineer, Brookline, Massachusetts, 1894-1898. Assistant engineer maintenance, Chicago, 1899-1900, resident engineer in charge construction in Iowa, 1900-1902, C.,B.&Q. R.R. Designer, American Bridge Company, Pittsburgh, 1902.
Instructor civil engineering, 1902-1903, asset. professor, 1903-1913, associate professor, 1913-1914, professor, since 1914, Harvard. Also professor Massachusetts Institute of Technology, 1914-1918. Dean Harvard University Engineering School, since 1920.