mr. polanski is in his element here 
(ROOT (S (NP (NNP mr.) (NNP polanski)) (VP (VBZ is) (PP (IN in) (NP (PRP$ his) (NN element))) (ADVP (RB here)))))
(ROOT (S (NP (NNP ) (NNP )) (VP (VBZ ) (PP (IN ) (NP (PRP$ ) (NN ))) (ADVP (RB )))))