Muthui Kariuki holds a degree in B.Education(Hons) from Kenyatta University,Post Graduate Diploma in Mass Communication from University of Nairobi and a Masters Degree in Communication from University of Nairobi.
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In his teaching career Muthui taught English and literature at Starehe Boys Center for five years, from 1981 to 1985.Some of his prominent students include Kwamchetsi Makokha and Peter Kenneth(a presidential candidate in the 2013 general elections).