If he needs one. There's a famous legal aphorism that "a lawyer who represents himself has a fool for a client." (Meaning: it's foolish to represent yourself; hire another lawyer to represent you.)
Yes, lawyers need lawyers. If a lawyer is sued, they will hire counsel. If they do not have an expertise in a subject, they will hire a lawyer who is experienced in that area.
Truthfully, because most are liberal arts majors do not know what to do after graduating college and are mystified by the profession because television shows glamorize the profession, even though...