Ok Hyun Ma is a tax law expert with seventeen years of experience serving as a judge in various courts, including the Gwangju District Court (as Senior Judge at the tax division), the Supreme Court (as a Research Judge), the Seoul High Court, the Seoul Northern District Court, the Seoul Administrative Court, the Suwon District Court, and the Gwangju District Court. Mr. Ma's practice at Lee & Ko is primarily focused on tax litigation, securities litigation, tax consulting and civil litigation involving accounting and tax issues.