Intellectual Property Law Firm. Greenberg & Lieberman is a national and international law firm based in Washington, D.C. Established in 1996 by Michael Greenberg and Stevan Lieberman, the firm is known for its expertise in the technology-law areas of intellectual property, patent and trademark prosecution and litigation, domain names, virtual worlds, and software contracts and is among the most influential entities in the field of domain names. The firm and its attorneys cater to individuals, small businesses and large corporations alike. Because of our technical knowledge our firm also is in a unique position to assist government contractors with their patent and other intellectual property needs.