Historian and Professor Eugene Borza who is credited as "Macedonian
specialist" by the American Philological Association, and who have
done extensive studies regarding the ethnicity of the ancient
Macedonians, had also presented in-depth analysis that the ancient
Macedonians were not "Slavs" or mixture of Slavs and Romans as
Macedonian Slavonic position claim. In his Macedonia Redux Borza
writes:
The Macedonian kingdom was absorbed into the Roman Empire, never to
recover its independence. During medieval and modem times, Macedonia
was known as a Balkan region inhabited by ethnic Greeks, Albanians,
Vlachs, Serbs, Bulgarians, Jews, and Turks.
more in
http://www.macedoniaontheweb.com/forum/macedonia-articles/2642-why-macedonian-slavs-stealing-greek-macedonian-history.html#post23845
or
http://modern-macedonian-history.blogspot.com/