He spent his entire career at Lowell Observatory in Flagstaff, Arizona, where he was promoted to assistant director in 1915, acting director in 1916, and finally director from 1926 until his retirement in 1952.
El și-a petrecut întreaga carieră la Observatorul Lowell⁠(d) din Flagstaff, Arizona, unde a fost promovat director adjunct în 1915, director de activități din 1916, și în cele din urmă director din 1926 până la pensionarea sa, în 1952.