I came across the following article from earlier this year. You can click through for the abstract and link to download it in PDF format. He seeks to answer the question of whether Paul was “Jewish” or not.
Markus Cromhout, “Paul’s ‘Former Conduct in the Judean Way of Life’ (Gal 1:13) … or Not?” HTS Teologiese Studies / Theological Studies. 65:1 (2009): 12pp.