Hon. Koech Nelson went to Chemamul Secondary School for his Kenya Certificate of Secondary Education, he then proceeded to Lewis Ham College (UK) to pursue a Certificate in International Relations (Law). He went to Kenya School of Law for a Diploma in Paralegal Studies. He pursued a Bachelor of Business Administration at Kenya Methodist University.
He worked at Kenya Electrical and Allied Workers Union (KETAWU) from the year 1999 to 2000. He currently works as a warehouse supervisor at the Bike Alert Corporation (UK) as from 2008. He currently serves at the Kenya National Assembly as Member of Parliament, Belgut Constituency as from 2017 to date. He is a member of the following committees: Departmental Committe on Defence and Foreign Relations as well as the Committee on Implementation.