Prof. Wanjohi, mbadwa ya ku Kenya ataphunzira ali wamng'ono, anapita ku yunivesite ya Kenyatta komwe anakapeza B.Ed, M.Sc ndi Ph.D. madigiri. Mu 1989, adalowa nawo gawo la yunivesite ya Kenyatta ndipo adakwera mpaka paudindo wa pulofesa wa zamankhwala a zomera. Prof. Wanjohi panopa ndi Ag. Vice Chancellor ku Kenyatta University ndi Vice Chairman Kenya National Academy of Sciences
Prof. Wanjohi ndi amene wakhala patsogolo kulimbikitsa ndondomeko ya Sayansi kudzera m'njira zosiyanasiyana zatsopano komanso maudindo osiyanasiyana a utsogoleri ndi kasamalidwe mkati ndi kunja kwa Kenya. Zoperekazi zapangitsa kuti iye adziwike mdziko lonse komanso padziko lonse lapansi; iye a Fellow a Royal Society of Biology; a Fellow a Kenya National Academy of Sciences; ndi Fulbright Senior Research Fellow; ku Fellow -Akazi a ku Africa mu Kafukufuku wa Zaulimi ndi Chitukuko (AWARD) ndipo adadziwika kuti ndi Katswiri wodziwika bwino ndi Falling Walls Foundation ku Germany. Mu 2020, Prof Wanjohi anali m'gulu la asayansi azimayi 20 omwe adalemba m'buku lakuti "Kulimbikitsa atsikana kutenga nawo gawo mu STEM: Inspiring Stories of African Women Scientists" lofalitsidwa ndi Forum for African Women Educationist (FAWE). Adasankhidwa kukhala mlangizi wa asayansi azamaulimi a Women Agricultural.
Tsambali lidasinthidwa mu Meyi 2024.
