A national and an international firm, the company has a particular focus on computer Internet law and patent prosecution for small businesses.
One of his earliest cases was a successful motion to dismiss copyright infringement suit based on lack of personal jurisdiction in Evan K. Aidman v. Mark S. Nelson in 1999.
[4] In September 1999[5] he was involved in a motion to dismiss patent infringement matter in Molnlycke Health Care AB v. Dumex Medical Surgical, a notable case in Internet law.
[6][7] In 2000 he was involved in a trademark infringement matter in the National Jewish Defense League (JDL) v. Mordechai Levy case which ended in November 2002 when JDL chairman Irv Rubin died in suspicious circumstances in jail,[8] and defended against copyright infringement in the Studio Martis, B.V. v. Joseph D. Wager Smith case.
They also represented some major global firms in trademark matters such as Nike, Inc. v. Niyad Enterprise in California Central District Court,[13] Microsoft v. Domain Source, Inc. and UDRP cases such as HSBC Finance Corp. v. Whois Privacy Protection Service, Inc..
The Alexandria Circuit Court ruled in favor of their client McMillan in a case which involved "a legal action initiated against a former employee charged with trademark infringement, trade secret violations, and domain theft.
In April 2011, Greenberg's firm lost a case representing Rabbi Shmuel Herzfeld of the Modern Orthodox Ohev Sholom - The National Synagogue in northwest Washington when U.S. District Court Judge Emmet G. Sullivan denied the request of the rabbi to have an upcoming local election rescheduled because it conflicted with the Jewish Passover.