He studied mass communication at Daystar University and currently works in Nairobi as an artist and freelance photographer. His works traverse two different spaces, nature, wildlife and street, urban environments. Manjahi's works have been exhibited and published in different spaces; Chrono Magazine publication (November 2017) “Young Guns” Group exhibition (2017) by Circle Art Gallery, “Frontiers of the Present” Group exhibition (2016) by Circle art Gallery, “Mwangalio Tofauti II” (2013) by the Goethe Instutut exhibited at the National Museums of Kenya and he has seen his works published by National geographic (2015) and Inside Africa, a publication by CNN (2014).