I don't claim to be an expect on Irving, but a cursory glance at Wikipedia shows that he is an active Holocaust denier that an English court found "persistently

I don't claim to be an expect on Irving, but a cursory glance at Wikipedia shows that he is an active Holocaust denier that an English court found "persistently and deliberately misrepresented and manipulated historical evidence." I'm sure there is more to his story, but to say that he "certainly deserves" to be called a historian is pretty simplistic.