Richard Momoima Onyonka was born in 1962. Momoima attended Otamba and St Mary’s Mosocho Primary School, Kisii High School and thereafter St Mary’s School, Yala before he joined the University of Nairobi where he graduated with a Bachelor of Commerce degree. In 1982, Momoima was among the students who were jailed over the riots of the abortive coup and had to return there later in 1984 and completed his course in 1985. After graduation, Hon. Momoima went to North Carolina State University where he graduated with a Masters degree in management in 1986. He returned back to Kenya in 1992 during the first multi party elections to help his father then incumbent MP for Kitutu Chache and Minister for Planning and National Development who was seeking re-election on a KANU ticket. His first opportunity arose when his father passed away in 1996 prompting a by election in which he lost to a new comer during the party (KANU) nominations.

Richard Momoima is blessed with three children; Moraa [20] (New Jersey,USA), Oeri [11], and Nyaboke [4]. Born to Zachary Theodore Onyonka and Teresa Nyaboke Omoke, Momoima has several brothers and sisters from a multi family. From Joseph Wills Omoke's family are; Stella Moraa (Illinois, USA), Jacqueline Kwamboka (Kenya), Judith Kerubo (Minnesota, USA), Modestar Kemunto (Illinois, USA), Evelyne Bonareri (Iowa, USA), Jimmy Omae (Minnesota, USA), Peter Monari (Minnesota, USA) and Emmanuel Onyiego (Minnesota, USA). From Beatrice Onyonka's family are Tolia (Los Angeles, USA), Kiki (Kenya), David (Michigan, USA), Timothy (Kenya) and Naanjela (Kenya).

He is a financial economist by profession and currently runs personal businesses in Nairobi and Kisii. He has held positions in the Kisii KANU branch. Apart from having been a prolific campaigner for his father in the 1992 general election, the eloquent Momoima made fruitless trials in the 2002 election and the 1996 by election, losing to Jimmy Angwenyi in a nail-biting tussle during the primaries. His vision for the constituency includes economic empowerment of the common constituents, youth and women groups. High educational standards and reduction of poverty have been his major focus. He hails from Bogeka clan, having grown and lived up in Otamba, Nyamataro, Mosocho and Nairobi.

He is widely traveled throughout the world - Africa, Europe, America and the far East and has always and continues to be active in development matters in Kenya, donating generously all the time in aid of various development projects including schools and community projects, self help groups, churches, women groups, youth activities, funeral ceremonies, students going abroad for further studies, sick, personal aid, school fees in needy families and much more.