Between 1999 and 2002, Daniel Sennheiser worked for various communications agencies in Munich and Zurich, including Pixelpark, Concept! and Ogilvy Interactive. During this time, he counted numerous global businesses among his clients. In 2003, he joined Procter & Gamble, most recently, in the role of Associate Director of Design & Innovation, EMEA.

In March 2008, Daniel Sennheiser joined Sennheiser electronic where he created the Strategic Innovation department and focused on the long-term strategic orientation of the company. Since January 2011, he has been a member of the Executive Management Board. As President of Strategy and Finance, he was responsible for Strategic Marketing, Strategic Innovation, Technology and Innovation, Corporate Controlling, and Corporate Finance.

On 1 July 2013, Daniel Sennheiser and his brother Andreas Sennheiser were appointed CEOs, assuming overall responsibility of the company. Together they drive the strategy of creating innovative audio products and remarkable sound experiences for the end user. Their vision to actively participate in creating the future of audio is based on the 70-year history of Sennheiser, a distinct culture of innovation and a mutual passion for excellence.