Gisore grew up in Kibera, an informal settlement outside of Nairobi, Kenya, that is estimated to have between 800,000-1,000,000 people living there. In Kibera, there is no formal waste management system, leaving residents to throw their trash and human waste outside. In 2017, Gisore started Slums Going Green and Clean, a community-based organization focused on waste management in Kibera.
Slums Going Green and Clean teaches residents of Kibera about waste management, and their team of volunteers visits over 2,000 households twice a week to collect trash and take it to the landfill. They have a team of support people who volunteer, including a social worker and nutritionist, who can check in on the residents as waste is collected. Gisore also runs a library out of his home and holds regular community meetings to continue educating residents on important issues.