Hi again Tammy,
How certain are you he was from Mecklenburg? I have a friend that just checked the Zernin, Mecklenburg-Schwerin, church book for your Heiser and nothing found from 1827 to 1831 in births on a quick check.
There is another possiblility that he came from Zernin with today's name as Czernin of Kreis (County) of Kolberg-Körlin, of the old Hinterpommern (Eastern Pomerania in English) province, see:http://www.kartenmeister.com/preview/City.asp?CitNum=10337
Zernin was a few miles southeast of the large city of Kolberg way up near sea coast, see:http://www.ruegenwalde.com/pommern/karten/kolberg.htm
Old map of Hinterpommern:http://mitglied.lycos.de/pomerania2/images/pomue2.jpg