Martin Wolff

Gruner + Jahr Deutschland GmbH publishes printed and digital media products. The company distributes premium magazines under the STERN, GEO, BRIGITTE, ESSEN & TRINKEN, SCHÖNER WOHNEN, CHEFKOCH, BARBARA, BEEF, and 11FREUNDE brands. It also operates the international digital marketing platform AppLike. The company was founded by John Jahr, Sr., John Jahr, Gerd Bucerius, and Richard Gruner on June 30, 1965 and is headquartered in Hamburg, Germany.

HMS Hamburg Media School GmbH engages in the operation of a media school. Its courses include digital journalism, digital media, digital and media management, film, digital change and trends, digital journalism fellowship, in-house and customized, as well as online marketing and social media. It also offers part-time training courses and music business summer school. The company was founded in 2003 and is headquartered in Hamburg, Germany.

Mediengruppe RTL Deutschland GmbH owns and operates television stations and provides online content services. It offers free TV channels, pay TV channels, online services, mobile TV channels, program production services, licensing and merchandising services, games, program sales, broadcasting and technology services. The company was founded in 2007 and is headquartered in Cologne, Germany.

Trainingswerk GmbH provides fitness center services. The private company is based in Kirchberg, Germany. The CEO of the German company is Stephan Schäfer.