Here's an article saying he recently signed with Vfl Frohnlach: http://www.fupa.net/berichte/frohnlach-holt-us-amerikaner-zackery-mahon-44841.html His InfoSport profile says he's an '89 from Texas who played at Longwood College. http://www.infosportinc.com/2012zackerymahon.html Frohnlach is a fourth-division club.
Started and played a half at striker vs. Nuremberg II on 3/3: http://www.transfermarkt.co.uk/en/1-fc-nuernberg-ii-vfl-frohnlach/index/spielbericht_2235112.html