Donovan Jackson is a four-year player (three year starter) expected to come pretty early off the draft board from Ohio State. Just how early? First round isn't out of the question, though most mock drafts at this point have him slipping to somewhere in the second round.
Jackson started all 13 games for the Buckeyes in his sophomore and junior seasons, and while he can sometimes get beaten on the edge by elite pass rushers, he was a stalward on the offensive line throughout. He missed two games in his senior season, but it's what he did that year that should most impress NFL scouts.