As of about six months ago, the state of the art in this field is that you would, for instance, go up to the following psychologist with fabulous hair, and you'd say, "Steve, you're an expert on the irregular verbs.
Desde hace unos 6 meses la vanguardia en este campo dice que, por ejemplo, uno tiene que ir a ese psicólogo de pelo fabuloso y decirle: "Steve, eres experto en verbos irregulares.