Mr. Chittenden's professorship at the New York Institution for the deaf and dumb ran from 1838 to 1843.

The evidence

• “Benjamin Silliman, are of this number. During the year subsequent to his leaving college, he was engaged in teaching in a family school in Baltimore, Md., and, from 1838 to 1843, was a professor in the New York Institution for the deaf and dumb. He studied theology while there engaged, and received his diploma from the Union Theological Seminary of New York, in 1842.”

  1879-history-of-rock-county/18-bios-beloit.md, PDF p. 737

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources