Mr. Ndwiga is a newly elected Senator of  Embu County. He was previously the Minister for Cooperatives and Member of Parliament of Manyatta. He was first elected Member of Parliament in 1992 on a DP ticket and retained the seat in 1997 on the same ticket. In 2007, he was elected MP on a Narc ticket. Mr. Ndwiga contested for the Senate seat in 2013 on a The National Alliance ticket but lost to Lenny Kivuti of APK. He was critical in the lobbying for the tarmacking of the Mutunduri-Kianjokoma road. The development of the road has been a development issue since independence. Previously, Mr Ndwiga, was  an  accounts clerk at Coca Cola Africa. He also served as an Agency Manager at Alico (K) Ltd. In 2014, he was appointed as chair of Tanathi Water Service Board (TAWSB). Moreover, he served as the chairman of the Export Promotion Council (EPC). Further, Mr. Ndwiga was appointed as Chairperson of Embu Level Five Hospital. Mr Ndwiga is an alumni of Siakago High School and Kamama Secondary School.