He became an associate editor of the
Transactions of the American Mathematical Society in 1907 and a research associate of the Carnegie Institution in 1908. Besides various contributions to mathematical and astronomical journals he was the author of:
- An Introduction to Celestial Mechanics (1902; second revised edition, 1914)
- An Introduction to Astronomy (1905)
- Descriptive Astronomy (1912)
- Periodic Orbits (1913)
- Differential Equations (1930)