[2][3] When Wadsworth resigned as State Geologist of Michigan in 1893, Hubbard was appointed to the position.

[6] In 1905, he was appointed to the Board of Control of the Michigan College of Mines, a post he held until 1917.

In 1910, he was appointed to the Board of Regents of the University of Michigan, and was elected in 1911 and each year afterward until 1933.

[5] In his later years, Hubbard was a snowbird, living in Florida during the winter and Michigan's Keweenaw Peninsula in summer.

[7] Hubbard collected a large library of Americana, portions of which were sold in 1914 and 1935.