Frost practiced with the Detroit-based law firm Dickinson, Wright, Moon, Van Dusen & Freeman, now Dickinson, Wright PLLC, from 1974 through 1996, in the areas of commercial litigation, antitrust, and bankruptcy. He was a partner with the firm from 1981 to 1996 and chaired its hiring and pro bono committees.
In addition to his Law School activities, Frost has served as a commercial panel arbitrator for the American Arbitration Association and has presented before the Michigan Academy of Science, Arts & Letters and the Legal Writing Institute. He also has served as chair of the Survey Committee of the Association of Legal Writing Directors and as an editor of Legal Writing: The Journal of the Legal Writing Institute.