O'Halloran Kosoff Geitner & Cook, LLC ("OKGC") is one of the largest law firms in the Chicago area outside the Loop. Established in 1979 by a partner in a large Loop law firm, OKGC’s practice combines personalized service and affordability with the sophistication and specialization of much larger firms. Martindale-Hubbell has honored OKGC with its "AV" rating, the highest available.

Size of the firm aside, OKGC has elected not to try to be all things to all people. Instead, the firm’s practice is concentrated in defense of claims against public entities, officials and employers; trusts & estates; business transactions, counsel and litigation; real estate; and construction law. OKGC’s primary business objective is to develop and maintain long-term relationships as legal, business, financial and tax advisors to the firm’s clients. In fact, the primary source of new business for OKGC is referrals from old clients.