is authentic to the core of his being 
(ROOT (S (VP (VBZ is) (ADJP (JJ authentic) (PP (IN to) (NP (NP (DT the) (NN core)) (PP (IN of) (NP (PRP$ his) (NN being)))))))))
(ROOT (S (VP (VBZ ) (ADJP (JJ ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (NN )))))))))