Kamotho was born on 5 December 1942 in Gacharageini village in
Fort Hall District. He joined the Muthangari Primary School in
Fort Hall in 1948 and sat for
CE in 1952. He later joined Njumbi Intermediate School in 1955. In 1958, he sat the Kenya African Preliminary Examination and was admitted to
Nyeri High School. He sat for the Cambridge Secondary Education Examination in 1962 and obtained a Division Two. He worked for the East African Customs and Excise as a trainee customs officer in
Mombasa and later joined Standard Chartered Bank. He applied for a Russian scholarship and joined the
Moscow State University in 1964 where he studied economics but quit a year later. He later got a scholarship from the Institute for International Education, which enabled him to study at
Syracuse University in the US and obtained a degree in liberal arts. After finishing his first degree in 1968, he returned to Kenya to teach at the Kenya Institute of Administration. In 1969, he went to study at the
University of Birmingham and obtained a master's degree in Development Administration and Social Sciences. ==Political career==