David S. ali ndi m.sc. kuchokera ku yunivesite ya Briteni, M'tanja, ndipo anali wachichepere komanso m'modzi mwa omwe amafunsidwa kwambiri ku yunivesite asanakhale nawo. Wafalitsa ntchito zosiyanasiyana m'magazini asayansi. Wakhala akupanga maphunziro a culcouver kwa zaka zambiri ndikuphunzitsa SSAT, Anali, Ap, IB, zilengedwe, mankhala, fisidi, Maths ndi Science maphunziro. Kuphatikiza pa Chingerezi, amalankhula Chijeremani, Sweden ndi Wachichaina. Ali ndi chiphunzitso chosangalatsa komanso chosangalatsa ndikulimbikitsa ophunzira ake ndi chidwi chake.