His first New York stage appearance was in the
off-off Broadway production of ''
Mayberry's Revenge
at the Terry Schreiber Theater. After work in regional theater and years of jobs in warehouses and construction, he began acting in films and television at age 34. His feature film credits include I Know What You Did Last Summer, The Reaping, The Mechanic
, Runaway Jury and Forty Shades of Blue, among others. He appeared in the Millennium Films release Homefront, as Lewis, which opened in November 2013. In seasons 2 & 3 of the Sundance series Rectify, he portrays Lid Comphrey. In five episodes of season two of the AMC series Turn: Washington's Spies, he portrays Warden Officer Yates. Greer plays Sheriff Bernie Watts in the 2015 film American Ultra. He plays Roman in the final two episodes of season six of The Walking Dead''. == Personal life ==