Mr. Lange is a litigator who represents clients in diverse antitrust and IP matters before federal courts and agencies, especially cases at the intersection of intellectual property and antitrust law, such as standard setting, IP licensing, and patent misuse. He has represented companies in the technology, telecommunications, pharmaceutical, manufacturing, financial services and transportation sectors in complex antitrust and IP matters in state court, US district courts and federal appellate courts. Recent cases have involved sections 1 and 2 of the Sherman Act, state law antitrust and unfair competition claims, as well as patent damages and enforceability.

In addition to civil litigation, Mr. Lange represents clients in criminal and civil antitrust investigations, and counsels clients on the antitrust implications of business practices such as distribution incentives, advertising restrictions, patent licensing and joint venture formation. He has also secured regulatory clearance for acquisitions before the Department of Justice and the Federal Trade Commission.

Mr. Lange also has an active pro bono practice in which he has represented clients such as a disabled Iraq war veteran, a small business owner and a federal employee in civil rights and benefits matters before US courts, federal agencies and local government.

Earlier in Mr. Lange's professional career, he worked for seven years in the United States Congress, including as a legislative assistant for a member of the Senate and a legislative director for a member of the House of Representatives. He was also a senior legislative representative for a US civil rights/civil liberties organization.