Osen LLC is a unique law firm. Despite the Firm’s relatively small size, it routinely litigates cases around the world and in courts across the United States against some of the world’s largest and most powerful corporations and some of the nation’s most prestigious law firms. The Firm’s practice focuses primarily on highly complex legal matters, often involving cutting edge issues of law and matters of political, moral, and historical significance. The Firm is well known for its landmark work on behalf of victims of Nazi and Communist era persecution, and for its ground-breaking practice in civil counter-terrorism litigation. With the assistance of able local counsel, the Firm has won important legal victories both in the courts and through the successful resolution and settlement of highly complex reparations and property re-conveyance matters. Its efforts have created important legal precedents in several areas including enlarging the scope of factual considerations used to determine the standards for Nazi era confiscations and clarifying the standards foreign financial institutions have to satisfy to comply with United States anti-terrorism laws.
Osen LLC continues a tradition of charting new legal paths with its creative approach and its commitment to undertaking uncommon legal challenges. Our Firm continues to be lauded for its expertise in European re-privatization matters, and is also regarded as one of the leading experts in cases concerning terrorism financing litigation, money-laundering, and human rights violations.
In addition to its attorneys, Osen LLC also employs full time translators and investigators. The Firm also maintains well-established relationships with experienced law firms worldwide. Through these relationships and staffing commitments, Osen LLC possesses the ability to protect its clients' interests in local, national, and foreign jurisdictions.







