He served as a member of the Board of Visitors at Harvard Observatory in 1924 .
From 1922 and 1946 he was chairman for the Committee on the Measurement of Geologic Time for the National Research Council .
chairman served as a member of the Board of Visitors at Harvard Observatory in 1924 .
From 1922 and 1946 he was chairman for the Committee on the Measurement of Geologic Time for the National Research Council .