The historical analysis techniques used by biblical scholars have been questioned, and according to James Dunn it is not possible "to construct (from the available data) a Jesus who will be the real Jesus." Classicist historian A. N. Sherwin-White "noted that approaches taken by biblical scholars differed from those of classical historians." Historian Michael R. Licona says biblical scholars are not trained historians for the most part. He asks, "How many have completed so much as a single undergraduate course pertaining to how to investigate the past?" Licona says N. T. Wright, James G. D. Dunn, and Dale Allison have written substantive historically minded works using hermeneutics, but even so, there remains "no carefully defined and extensive historical method...typical of professional historians."