Wilfred Nderitu is an advocate of the High Court of Kenya and was admitted to the roll of Advocate in 1989.  He was the Chairman of the Kenyan Section of the International Commission of Jurists (ICJ-Kenya) in 2005 to 2009. Prior to this, he served as a Council Member of ICJ-Kenya between 1999 and 2005 and as Vice-Chair between 2005 and 2005.  

Between 2002 and 2007, he was assigned by the United Nations International Criminal Tribunal for Rwanda, Arusha, Tanzania, as Lead Defence Counsel in The Prosecutor-v-Simon Bikindi. In August 2007, he was assigned by the International Criminal Court (ICC) to act as Duty Counsel in Gulu, Uganda, in connection with ensuring that international standards were maintained in the procuring of part of the evidence relating to arrest warrants against 

Joseph Kony and others. Between August 2008 and April 2009, Mr. Nderitu was again assigned by the United Nations International Criminal Tribunal for Rwanda, this time as amicus curiae in the cases of The Prosecutor-v-Édouard Karemera and others and The Prosecutor-v-Casimir Bizimungu and others in the investigation of allegations of perjury by a witness in those cases. Mr. Nderitu is on the List of Qualified Counsel at the International Criminal Court, the United Nations International Criminal Tribunal for Rwanda and the Special Court for Sierra Leone. 

Mr Nderitu is currently the Senior Partner at Nderitu & Partners, Advocates, a law firm that he founded in 1996. His areas of practice include, International Criminal and Human Rights Law, especially the Law of Genocide and Crimes against Humanity, Civil and Criminal Litigation, Insurance Law, Banking, Conveyancing, Corporate and Commercial Law.