"Steven's advocacy is assured, persuasive and thoroughly prepared to the highest level. He is very approachable and re-assuring of clients."
Steven specialises in crime (international and domestic), extradition, and human rights. He has experience of dealing with the most complex matters and representing high-profile clients before both international and domestic courts and has acted on behalf of accused, States, victims and witnesses.
Steven has been working in the field of international crime for over 30 years. He first worked as a legal assistant to a judge at the International Criminal Tribunal for the former Yugoslavia (ICTY) and then as representative of Trinidad and Tobago during international negotiations on the establishment of the International Criminal Court (ICC). He has previously served as a consultant in the Legal Advisory Section to the UN International Independent Investigation Commission investigating the assassination of Prime Minister Rafik Hariri in Beirut, Lebanon.
Steven is also co-author of one of the leading practitioner texts on international crime ‘International Criminal Practice’ (OUP).
Steven has appeared in numerous cases before nearly all the various international courts and tribunals, as well as in universal jurisdiction cases before domestic courts:
Steven is regularly instructed in cases raising human rights issues in both domestic courts and before the European Court of Human Rights:
Steven has conducted numerous extradition cases under both the 1989 and 2003 Extradition Acts:
Steven has appeared in a number of high-profile terrorist and protest cases:
Steven has represented victims of both international and domestic crime. He regularly advises NGO’s and victims’ groups on possible prosecution of those responsible and has acted in securing financial compensation for victims of crime.
Over 100 TV and radio appearances: CNN, BBC World, BBC News 24, Sky News, ITN news, Channel 4 News, The World Today. Commenting mainly on proceedings against Slobodan Milosevic, Saddam Hussein and Charles Taylor. Published in The Guardian – Charles Taylor trial (2012) and The Times – Saddam Hussein proceedings (2004), International Criminal Court (2002), Fair Trials in Kosovo (2000).
LLB (Hons)
LLM (International Law)
"Steven is one of the most eminent practitioners before the International Criminal Court and is an excellent advocate. He is robust and persuasive yet not confrontational or aggressive in ways that are often detrimental to the interests of a client. He is very reliable."
"Steven's advocacy is assured, persuasive and thoroughly prepared to the highest level. He is very approachable and re-assuring of clients."
"Steven is very calm at all times. He is incredibly intelligent and very well respected."
"Steven is very very clever and a delight to work with. He is kind and compassionate."
"He is highly reliable and demonstrates strong commitment to helping victims of human rights abuses."
"Very committed and hard-working, while also sophisticated and brilliant in his approach."
"Inspiring, expert at what he does and diligent. His powers of persuasion are just incredible in court."
"He is a superb, hard-working professional who can empathise with clients"
"An outstanding silk and an extremely personable advocate whom clients and colleagues warm to."
"Very competent criminal silk. Lots of heavy overseas work. Very personal and easy to work with."
"A very strong advocate who passionately fights his corner and always ensures a just and fair outcome."
"Steven is an expert in this field and a compelling advocate. In potentially very emotive proceedings Steven is calm and authoritative and of great re-assurance to clients. He excels in criminal appeals, demonstrating thorough preparation and encyclopaedic knowledge of the law."

"Steven's advocacy is assured, persuasive and thoroughly prepared to the highest level. He is very approachable and re-assuring of clients."
Legal 500 2026
Contact Steven : stevenpowles@matrixlaw.co.uk | +44 (0)20 7404 3447
Contact Steven 's Practice Team (Team T): TeamT@matrixlaw.co.uk
Steven specialises in crime (international and domestic), extradition, and human rights. He has experience of dealing with the most complex matters and representing high-profile clients before both international and domestic courts and has acted on behalf of accused, States, victims and witnesses.
Steven has been working in the field of international crime for over 30 years. He first worked as a legal assistant to a judge at the International Criminal Tribunal for the former Yugoslavia (ICTY) and then as representative of Trinidad and Tobago during international negotiations on the establishment of the International Criminal Court (ICC). He has previously served as a consultant in the Legal Advisory Section to the UN International Independent Investigation Commission investigating the assassination of Prime Minister Rafik Hariri in Beirut, Lebanon.
Steven is also co-author of one of the leading practitioner texts on international crime ‘International Criminal Practice’ (OUP).
Steven has appeared in numerous cases before nearly all the various international courts and tribunals, as well as in universal jurisdiction cases before domestic courts:
Steven is regularly instructed in cases raising human rights issues in both domestic courts and before the European Court of Human Rights:
Steven has conducted numerous extradition cases under both the 1989 and 2003 Extradition Acts:
Steven has appeared in a number of high-profile terrorist and protest cases:
Steven has represented victims of both international and domestic crime. He regularly advises NGO’s and victims’ groups on possible prosecution of those responsible and has acted in securing financial compensation for victims of crime.
Over 100 TV and radio appearances: CNN, BBC World, BBC News 24, Sky News, ITN news, Channel 4 News, The World Today. Commenting mainly on proceedings against Slobodan Milosevic, Saddam Hussein and Charles Taylor. Published in The Guardian – Charles Taylor trial (2012) and The Times – Saddam Hussein proceedings (2004), International Criminal Court (2002), Fair Trials in Kosovo (2000).
LLB (Hons)
LLM (International Law)
"Steven is one of the most eminent practitioners before the International Criminal Court and is an excellent advocate. He is robust and persuasive yet not confrontational or aggressive in ways that are often detrimental to the interests of a client. He is very reliable."
"Steven's advocacy is assured, persuasive and thoroughly prepared to the highest level. He is very approachable and re-assuring of clients."
"Steven is very calm at all times. He is incredibly intelligent and very well respected."
"Steven is very very clever and a delight to work with. He is kind and compassionate."
"He is highly reliable and demonstrates strong commitment to helping victims of human rights abuses."
"Very committed and hard-working, while also sophisticated and brilliant in his approach."
"Inspiring, expert at what he does and diligent. His powers of persuasion are just incredible in court."
"He is a superb, hard-working professional who can empathise with clients"
"An outstanding silk and an extremely personable advocate whom clients and colleagues warm to."
"Very competent criminal silk. Lots of heavy overseas work. Very personal and easy to work with."
"A very strong advocate who passionately fights his corner and always ensures a just and fair outcome."
"Steven is an expert in this field and a compelling advocate. In potentially very emotive proceedings Steven is calm and authoritative and of great re-assurance to clients. He excels in criminal appeals, demonstrating thorough preparation and encyclopaedic knowledge of the law."