He has had a stint at the helm of the Kenyan Parliamentary Committee on Finance, Trade, Tourism and Planning. He holds a bachelor’s degree in commerce from the University of Nairobi, and an MBA from the United States International University (USIU) of Nairobi.
In his career Mutahi has been the advertising manager, Mashambani Magazine, and the group- advertising manager, commercial manager and commercial operations director of the Standard Group Limited between 1987 and 1994. He is currently the chairman of Research International, East Africa and the group-managing director of Tell- em Public Relations (E.A) Ltd
He has many professional memberships including the Marketing Society of Kenya, the Kenya Institute of Management, the parliamentarian network of the World Bank , and the commonwealth parliamentary association.
He attended Kihate Primary School (1965- 1971), Kagumo High School- both O levels and A levels (1972- 1977), Nairobi University (1978- 1981), United States International University- USIU (1988- 1992).
He is married to Mrs Ann Wanjiku Mutahi and they have four children. Kagwe, Njoroge, Nyawira and Kahumburu.