About Osen LLC

Osen LLC stands at the forefront of groundbreaking civil counter terrorism litigation.


Our clients include veterans who served in Iraq and Afghanistan, the families of Americans killed and injured in suicide bombings in Israel, and the families of American missionaries kidnapped, held hostage, and murdered in Colombia. The cases we litigate are often massive in scope, complex and time intensive. As a result, we accept only a limited number of matters to ensure that we are accessible and responsive to our clients and uphold our high standards of professionalism.


Our firm has been described as having “a penchant for tackling larger-than-life cases” and being “on a mission to fight terrorists by cutting off their bankroll,” and The New York Times has called Gary M. Osen, our managing partner, an “internationally consulted legal authority on terror financing.” 


Our dedicated team of experienced lawyers aspires to demonstrate the same courage and determination in the legal system that our clients exhibit every day.

Leading Cases

First and leading lawsuit on behalf of more than 350 families of fallen members of our military, wounded veterans, and...
Société Générale (SGBL) Case
In July 2004, Osen LLC filed the first civil lawsuit brought against Arab Bank, Plc, on behalf of Americans who were...
Arab Bank Cases
Osen LLC (together with Turner & Associates, P.A.) represents more than 240 families of Americans who were victims...
Karcher v. Iran Cases