Freeborn & Peters LLP added Sean J. Quinn as a partner in the firm’s Chicago office. He is a member of the firm’s litigation practice group and intellectual property team.Quinn focuses his practice on helping businesses protect their intellectual property and resolving complex commercial disputes. He manages intellectual property litigations involving trademark, trade dress, copyright, trade secret and unfair competition claims.• Two attorneys from Dussias Wittenberg Koenigsberger LLP were named as …