Dirk Ströer is the son of Ströer founder Heinz W. Ströer. He inherited 50% of the company from his father and still holds almost 20% of the advertising and media group today. Ströer is also a publisher of media brands such as T-Online and Watson.de. After graduating in business administration, Dirk Ströer founded City Design GmbH in 1998, a company specialising in the marketing of advertising media in Germany. In 1999, he turned his attention to setting up the Polish branch of the Ströer Group in Warsaw. Later that year, he founded orangemedia.de GmbH and neu.de GmbH in Hamburg, which marked the beginning of Media Ventures GmbH. In the following years, Media Ventures GmbH developed successful online portals such as weg.de, pkw.de and mp3.de. In addition, Dirk Ströer has invested in various companies, including the internet company Hoccer in 2014 and Northern Bitcoin AG in 2018 through his investment company Krypto Ventures GmbH. Ströer is also active in the real estate business through his company Property Ventures, which manages private real estate transactions in Germany and abroad and acts as a real estate holding company. Its first deal was an investment in Timeless, a developer of luxury real estate. A first luxury property was realised in Kitzbühel, Austria. In 2019, Ströer bought the then most expensive house in Cape Town. He is a member of the Cologne carnival association Goldene Jungs.