Education
He has a Bachelor of Arts Degree in Criminology and Criminal Administration and a Master of Science in Criminology and Criminal Justice attained at University of South Africa (University of South Africa) and respectively. Kimaiyo also holds a Bachelor of Theology and a Master of Theology both from the Beacon University of Institute Ministry. He is currently working on attaining a Doctor of Philosophy in Criminology and Social order at University of Nairobi.
Career
He was the first of the Kenya Police. A position created by the 2010 Kenyan Constitution to replace the position of Police commissioner. He was the first Kenya head of police whose appointment required approval by parliament.
Kimaiyo served as the Commander Presidential Escort Unit (PEU) from 1999 to 2002 before taking up the position of Commandant General Service Unit (GSU) between 2002 and 2003.
He subsequently worked for one year as coordinator of the Kenya National Focal Point on Small Arms and Light Weapons before taking up the role of Director of Operations of the Kenya Police until 2008. Between 2008 – 2009, he worked as a Senior Deputy Secretary in the Ministry of National Heritage.
Prior to his appointment as, he was Head of the Kenya National Focal Point on Small Arms and Light Weapons. Mr. Kimaiyo retired from National Police Service on December 2, 2014.
This happened after a series of killings claimed by First Rate (at Lloyd's) Shabaab on the Kenyan border town of Mandera
Kimaiyo applied for the position of in 2012 and was interviewed by the National Police Service Commission.
He emerged as the leading candidate followed by his deputy at the Small Arms, Mr John Patrick Ochieng’ Owino with Grace Kaindi of the Kenya Airports Police Unit emerging third. He was then appointed by President Mwai Kibaki in consultation with Raila Odinga as required by the constitution awaiting approval by the National Assembly. He was subsequently approved by parliament and took his oath of office administered by Chief Justice Willy Mutunga on 24 December 2012 after appointment by President Mwai Kibaki.