Ruben is a former hunter/poacher who now works as an assistant researcher in the Udzungwa National Park in Tanzania. Realizing that he could not continue to hunt in the forest, he changed his path and became involved in conservation biology. His large knowledge of the jungle led a group of scientists to collect new data on the poorly described Mountain dwarf galago and more importantly to the discovery of a completely new species of mammals – the Grey Faced Sengi.