Arnold is a tax partner in the firm's Chicago office. His practice focuses on advising clients on a wide range of tax matters with particular emphasis on domestic and international corporate transactions such as mergers, acquisitions and divestitures including tax-free spinoffs, restructurings, tax-free reorganizations, leveraged buyouts, financings, cross-border structuring and joint ventures. He is nationally recognized for his work in connection with the tax aspects of renewable energy transactions, having advised members of President Obama's administration on renewable energy incentives. Arnold was formerly an adjunct professor of corporate tax at Chicago-Kent College of Law, and is a former chairman of the Corporate Tax Division of the Chicago Bar Association. He writes and lectures frequently on tax-related subjects.