Although he was a top lineman on his prep team, he also made a notable impact on special teams as one of the best long snappers in the region. Greenfield was a 2009 third-team All-Southwestern Conference selection in his senior season, helping Belleville West to its second straight playoff appearance.
A two-year starter, in 2008 Greenfield helped guide the Marrons to the postseason for the first time since 2002.