Born in Lodwar, Turkana, Kenya, Nasenyana’s first foray into modeling was in the Miss Tourism Kenya competition in 2003, at which she was crowned Miss Nairobi. It is here that she came to the attention of Lyndsey McIntyre of Surazuri Modeling Agency.
Soon afterward, Gamma Photo Agency came to Kenya to do a story on McIntyre’s scouting work and were so taken with Nasenyana that she became the main feature of the story, which later ran in France’s Gala magazine. The pictures taken anchored Nasenyana’s portfolio, presented to international agency Ford Models, who entered her in Ford’s Supermodel of the World competition.
In November 2003, Nasenyana traveled to Europe to build her portfolio prior to the Supermodel finals in New York City. She soon signed with agencies in London, Italy, Austria, Spain, Ireland, Canada and Sweden. Nasenyana participated in the New York Fashion Week alongside Naomi Campbell and Alek Wek for designers such as Baby Phat and Carlos Mienes before traveling to Milan to model for fashion houses such as Ungaro during the Italian Fashion Week. Paris was the final destination during the winter show season and British designer Vivienne Westwood made her the lead model in her show.
Since then, Nasenyana has shot several magazine editorials, a video for Lacoste, and a catalogue for Issey Miyake.