Onwonga start running competitively at age 20.[2] One of his first big races was the California International Marathon, where he placed 3rd.[3] From there, Onwonga went around the country to compete in other races.[4]
Onwonga competed in the Twin Cities Marathon three times.[5] In 1995, he was favored to win. During the race, there were reports that he was tripped by another runner, which dropped him from the lead. He finished third as Rafael Zepeda took first place.[6][7] In 1996, Onwonga placed first in the Twin Cities Marathon, crossing the line in 2:13:13.[8] Also in 1996, Onwonga won the Broad Street Run, a 10-mile run in Philadelphia, where he lived at the time.[9]
Onwonga was born in Kenya.[14] Following in his father's footsteps, he started running at a young age.[15] He attended the Kenya College of Communications and Technology.[16] After college, he moved to Pennsylvania, living in both Norristown and Philadelphia.[17] He was married in 1996.[18]
^Portzline, Aaron (November 5, 1998). "Columbus Race Great in the Long run". Columbus Dispatch.
^"Furthermore". The Washington Post. October 7, 1996.
^Zavoral, Nolan (October 9, 1995). "A perfect day for a Twin Cities Marathon - Zepeda kicks it in to win men's race; Coogan takes women's title". Minneapolis, Minnesota: Star Tribune. p. C1.
^Levy, Paul (October 7, 1996). "Runaway Victories". Star Tribune.
^"FURTHERMORE". The Washington Post. October 7, 1996.
^Thomas, Dave. "Broad Street Run". Belmont Plateau. Retrieved January 17, 2020.
^"Scoreboard". New Plymouth, New Zealand. Daily News. June 9, 1997.
^Portzline, Aaron (November 5, 1998). "Columbus Race Great in the Long run". Columbus Dispatch.