He focuses his practice on U.S. international taxation, with a particular emphasis on tax planning and international corporate transactions. He has broad experience in international tax issues such as subpart F, income sourcing and the foreign tax credit, cross-border mergers, acquisitions and restructurings, dual consolidated losses, foreign currency, inbound taxations and use of tax treaties. He writes and speaks regularly on international and corporate tax issues, as well as teaching classes in international taxation at San Jose State University in international taxation. William is the author of Corporate Separations and Divisions Involving Foreign Corporations and an expert contributor to Earning and Profits on Checkpoint Catalyst.