She was appointed by United Nations Secretary-General Ban Ki-moon as Prosecutor of the Special Court for Sierra Leone in February 2010,[1] replacing Stephen Rapp.
Hollis previously served as the Prosecutor of the Residual Special Court for Sierra Leone, which replaced the Special Court in December 2013; currently James Johnson, an adjunct professor at Case Western Reserve University School of Law, serves as the Chief Prosecutor for the Residual Special Court for Sierra Leone.
Hollis had worked as a consultant to the Prosecutor of the Special Court in 2002 and 2003, taking part in the initial investigations and providing advice on the requirements of international criminal law.
In 2006, she again worked as a consultant for the Special Court, amending the indictment against Charles Taylor and preparing the case for trial.
She has received honorary degrees from Case Western School of Law and Bowling Green State University.