Mr. Katayama has broad experience across a wide area of international and corporate matters, with a focus on intellectual property law and bankruptcy law. The patent litigation that he has worked on to date covers the fields of chemistry, electronics and machinery, which are cross border matters involving advanced technology such as biotechnology, semiconductors etc.. He also has experience in trademark, copyright and unfair competition litigation.

In the field of insolvency, he handled the corporate reorganization cases of Japan Airlines, Azabu, Tsuchiura, Riccar, Maruko, Muramoto Construction and Hokke Club as the trustee or the deputy trustee, and handled the liquidation case of Yamaichi Real Estate as the bankruptcy trustee. He has filed corporate reorganization cases for debtors including Japan Leasing, Life, Daiichi Hotel, Chiyoda Mutual Life Insurance and Kyoei Life Insurance. Mr. Katayama was responsible for overseas operations in the civil rehabilitation of the Sogo group. He has also handled civil rehabilitation as lead counsel for many golf courses, including Nitto Kougyo and Ryokuei, as well as other major debtors in various industries.

In the corporate law area, which often includes cross border matters, Mr. Katayama issues opinion letters on various corporate matters, conducts negotiations on M&A and other transactions, and provides consultations on legal affairs related to management. He also has deep knowledge and experience in the pharmaceutical industry. Mr. Katayama serves as an independent board member for some companies. Further, he provides advice on corporate governance and compliance for many corporations as their retained counsel.