A post entitled Did haplogroup J2a1 originate in Greece?, from December 2005, is a great example of the kind of blogging he does and is relevant to many of the participants in our project. An extract:
However, it could be argued that mobility within the Byzantine and Ottoman Empires may have introduced J2a1 from Anatolia to the Balkans. However, this does not explain the high diversity of J2a1 in Romania and Italy which were little if at all affected by Anatolian populations.Moreover the idea that J2a1 originated in Greece also explains the coastal distribution of J2 in the Mediterranean, observed by Di Giacomo et al.. It is well-known that Greek colonization was especially maritime.