From their website:
Konami Digital Entertainment, Inc. (KDEI), a wholly owned subsidiary of KONAMI CORPORATION (NYSE: KNM), is a leading, global developer, publisher and manufacturer of electronic entertainment properties, specializing in the home video game market.
Headquartered in Tokyo Japan, KONAMI CORPORATION first began operating in North America in 1982, and has been publishing computer and video games as Konami of America (KOA) since 1999 from its offices in Redwood City, California near San Francisco.
In October of 2003, KONAMI CORPORATION moved to strengthen its content planning and production by expanding its operations to Los Angeles, California under the new name of Konami Digital Entertainment, Inc.
This bold and exciting move was designed to strengthen the company’s worldwide business, North American market share and future growth in the interactive entertainment marketplace. Located in heart of the entertainment capitol, KDEI focuses on the areas of global product brand growth strategies, business development and licensing activities.