From Wikipedia:

Philipp Patrick Hannes Plein is a German fashion designer.

He is the founder and CEO of the Plein Group and Plein Holding, which includes the brands Philipp Plein, Plein Sport, and Billionaire. Headquartered in Lugano, Switzerland, the company specializes in the creation, production, and worldwide distribution of luxury goods. He is also the chief designer for the brands Philipp Plein, Billionaire, Plein Sport, and Plein Golf.