Hon. J.C. Kithinji is a holder of Bachelor of Education degree from Kenyatta University. She taught at Chogoria Boys High School and was the Principal of Makuri Girls High School from 1995 to 2013 within which she was the Chairperson of Kenya Secondary School Heads Association (KSSHA) both at the district and county levels, and Secretary at the provincial level. She also served as a member of the National Governing Council (KSSHA), Treasurer of SMASSE at the district and county levels and also a Chairperson of Maara and Meru South Education Bursary Committee.
Hon. Kithinji has also served in the church at different capacities such as:- Church Elder, Clerk of the Chogoria North Presbytery (2009- 2011) and the Chairlady of the Women’s Guild. Hon. Kithinji has undertaken several professional courses like: Christian-Muslim Relations with NCCK, SMASSE INSET course from Hiroshima – Japan, Educational Management, Financial Management and Educational Administration courses.