Assistant in Industrial Chemistry 1917-1918; Instructor 1918-1920; Faculty 1920-1925; School of Chemical Engineering Practice: Director, Bangor Station 1920-1921; Director, Everett Station 1921-1922; Assistant Director, Research Laboratory of Applied Chemistry 1922-1925; Department Head 1934-1961; Director, School of Engineering Practice 1934-1946; Director, Graduate School of Engineering Practice 1946-1961; Professor Emeritus of Chemical Engineering 1961-1974.
