home of the madduck/ blog/
Yes, apostrophe

Sorry, Andreas, Clint is now wrong, but he was right until I corrected him (falsely). The German Genitive takes no apostrophe, unless the declined word ends in 's' or 'x'. That is the only exception for the Genitive. You may still use it on commercial signs (Martin's Bar) though. Thus, "Clint Adams' Blog" is right.

I should have listened to alphascorpii all along.

(FWIW, I did verify this in the Duden just now.)