My mother's father's father. As I post these going through the tree breadth first, this is the first ancestor I do not have a picture for. At least not yet. (I didn't post pictures for the first few I posted, but there were pictures on the corresponding wiki pages, I was just negligent.)
I don't know a whole lot about him either. Born 1875 in Darke County, Ohio. Moved to Indiana, then Arkansas, then back to Darke County, Ohio, where he died in 1956.
The first of his three children was my mother's father. The last of his three children was my Uncle Ed... actually Great Uncle Ed. I visited Uncle Ed's house a few times as a child. I remember swapping Commodore 64 software with one of his grandkids.
But back to David Clement. The main other thing I know is that he was a Justice of the Peace for 36 years.
For more, see his wiki page.