Gordon Cox had been living in Bismarck for a number of years working as an attorney for the State Tax Commission before he joined O’Hare and Cox in their practice in 1925. He brought his experience from the State to the Firm and tried many cases related to tax law in addition to other defense work. When he had been with the Firm for five years, he became a namesake partner and the Firm name was changed to O’Hare, Cox & Cox.
Cox was also invested in the community and served on for-profit and nonprofit boards in the area. He also was a member of the North Dakota State Legislature for a number of years.
He stayed with the Firm until his retirement in 1966.