Management Board

The Management Board of United Internet AG consists of Ralph Dommermuth and Martin Mildner.


Ralph Dommermuth
CEO since 1988

Ralph Dommermuth laid the foundation for today’s United Internet AG with the formation in 1988 of 1&1 Marketing GmbH. He originally offered systemized marketing services for smaller software suppliers. He later developed additional marketing services for major clients, such as IBM, Compaq and Deutsche Telekom. With the growing professionalization of the internet, these marketing services for third parties were gradually reduced and the company offered its own internet services. In 1998 the qualified banker took 1&1 to the stock exchange. It was the first IPO of an internet company in Germany. In 2000, Dommermuth restructured 1&1 as United Internet AG.


Martin Mildner
CFO since 2020

Martin Mildner has been a member of the Management Board of United Internet AG since 2020 and responsible for Finance and Controlling, Risk Management/Internal Audit, Legal, Tax, M&A, Investment Management and Human Resources. Martin Mildner has extensive experience in the areas of Corporate Transactions, Compliance Management and Corporate and Tax Law. In his last position, he was Group General Counsel and Group Vice President M&A at Otto Group, where he worked for 13 years and played an active role in the strategic realignment of the company portfolio. Furthermore, Martin Mildner was a board member of several Supervisory Boards as well as Advisory Boards of companies of the Otto Group, such as OTTO, Hermes or Project A Ventures.