He is an elder of the Kauma Kaya forest. His knowledge of the forest comes from his father and grandfather and dates back to the 16th Century when the Mijikenda people first settled in the Kaya forests.
Just as Hilary learnt traditional forest knowledge from his father and his grandfather, he now passes it down to his grandson.
Thank you to Greg Armfield and WWF UK for the beautiful images of Hilary and his family and his forests.
To find out more about the coastal forests of Kenya, visit this page.