Who was William C. Jarvis???

I am looking at a familiar Thomas Jefferson quote from a letter to William C. Jarvis in 1820. It is widely available on the Internet and I can head for the library to the memorial edition (1903) of _The Writings of Thomas Jefferson_, a cited source. But--fast and dirty--Who was William C. Jarvis? I am working on a project and need context for the comment.

I have pasted the quote below.

Thanks for any help.

Sally

"I know no safe depositary of the ultimate powers of the society but the people themselves; and if we think them not enlightened enough to exercise their control with a wholesome discretion, the remedy is not to take it from them, but to inform their discretion by education. This is the true corrective of abuses of constitutional power."
--Thomas Jefferson to William C. Jarvis, 1820. ME 15:278