An international practice,(with an emphasis on Africa), comprising extensive advocacy and advisory experience on behalf of private and institutional clients both here and abroad, in business and general crime, corrupt practices, commercial litigation and health and safety. His work abroad is mainly in Africa advising companies doing business and litigating on this continent, particularly in Nigeria. He regularly advises the Nigerian National Petroleum Company in contractual disputes as well advising the Nigerian government on the legal consequences of corrupt or tainted contracts He has been called as an expert witness several times in cases involving Nigerian Law. He has worked in jurisdictions as disparate as Germany, Cayman Islands, Nigeria, Malawi and Tanzania. He has also undertaken work for the DTI, including insolvent trading and directors disqualification. He has prosecuted regularly for H.M Revenue & Customs. 

1999   :  Appointed Crown Court Recorder

2002   :  Appointed Queen’s Counsel

2004/8: Chair of the British Nigeria Law Forum

2004/8:  Gray’s Inn Advocacy Trainer – Grade “A”

2005   :   Elected Bencher of Gray’s Inn

 2006  :  Appointed  Joint Head of Chambers

2006   :   Elected Fellow of the Royal Society of Arts (“FRSA”)

2006/8:  Legal Advisor to Central Association of Nigerians in the UK (“CANUK”)

2007/8: Legal Assessor for the General Medical Council

2005   :  Appointed Senior Advocate of Nigeria

2005   :  Member of the Body of Benchers, Nigeria

2006/8:  Chair of g50 business group (“investing in Nigeria”)

2007   : Fellow Nigeria Leadership Initiative ("NLI")

Called to the Bar 1985

Barrister and Solicitor of the Supreme Court of Nigeria 1986

Appointed Queen's Counsel 2002

Joint Head of Chambers 2006

 R v Howe & Son (Engineering) Ltd [1999] 2 ALL ER 249;

Leading case on sentencing in health and safety cases

 R v.Davies (David Janway) [2002]EWCA 2949 at 586 

Leading case on reverse burden in health and safety cases and impact of Human Rights Act.

 R v. P Ltd and Another [Times Law Report 13^th August 2007]

Leading case on mens rea of officer of a body corporate under s.37 HSWA 1974

 R v. Hampshire [1995] 2 ALL ER 1019

Competency of child’s evidence in sexual cases

 Howard v. Shirlstar Container Transport Ltd [1990] 1 WLR 1992

Contract involving illegal performance – effect.

 R v. Rachel[CA] 1993 Cr App R. (S) 265

Sentencing in Manslaughter cases.

 Krumpa & Anor v. DPP [1989] Crim LR 295.

S39 Public Order Act 1986

Oba Nsugbe QC is constantly listed year after year, in the Chambers & Partners Legal Guide to the Legal Profession as one of the leading barristers in the United Kingdom.  The 2010 edition states "he impresses interviewees with his calm and genial manner, both in and out of the courtroom." Consequently, "judges and juries warm easily to him," and he is also said to "work extremely well in a team with solicitors and clients."

Past editions have stated "peers and solicitors... keen to sing the praises of this... true gentleman who deserves his fabulous reputation" and  cite his “technical excellence” as one of his strengths. as well as  “possessing a fine forensic mind, describing him as a “rising star” at the Bar of England and Wales.