Gemma's specialisms are extradition, international criminal law and family. An excellent knowledge of human rights underpins each of these areas. In extradition, Gemma represents governments, judicial authorities and requested persons. She has appeared in many high profile cases in recent years, such as Sweden v. Julian Assange and Rwanda v. Brown and others. She is known for her ability to deal with technical legal arguments, particularly where there is no clear answer. At the same time, Gemma's practical approach to her cases to achieve the desired outcome. A particular specialty is abuse of process arguments raised following extradition to England and Wales. Gemma is a member of the ELA and DELF and frequently provides comment to the media on many aspects of extradition law. As a result of her involvement in the Rwandan extradition case, Gemma has gained experience in the field of international criminal law. In 2011, Gemma spent time in the Office of the Prosecutor at the International Criminal Tribunal for Rwanda and she remains on the Trial Attorney roster. Gemma's family practice has a predominantly international dimension, although she appears in a full range of cases. She has significant appellate experience including in the Supreme Court.