Hon. Justice Isaac Lenaola hails from Samburu County and is an alumnus of the University of Nairobi and the Kenya School of Law. After admission to the bar, he practiced law in Nairobi specializing in Commercial Law and Land Law and served as a Commissioner both at the Peoples Commission of Kenya (PCK) and at the Constitution of Kenya Review Commission (CKRC). He also served as a member of the Tribunal Investigating the conduct of Puisne Judges.
He joined judicial service in 2003 and worked as Resident Judge in Embu, Meru, Machakos and Kakamega High Courts. As a High Court Judge, Hon. Justice Lenaola also served as a Commissioner at the Judicial Service Commission (JSC). He was previously a Member of the Board, Judicial Training Institute (JTI) (now known as KJA) and Chairman of the Kenya Magistrates and Judges Association (KMJA) and Treasurer of the East African Magistrates and Judges Association (EAMJA).