Dr. Greger is the founder and namesake of the law firm Dr. Greger & Collegen. The law firm specializes in banking and finance law. We represent private and institutional investors and capital investors throughout Germany in commercial and banking law proceedings. A further focus of the law firm is in the area of digital property offenses and the associated legal constellations. Dr. Greger is a member of various creditors' committees where he represents the interests of shareholders; among other things, he is active in the Wirecard proceedings.