Brother Tabichi is a member of the St Franciscan Friars, a religious order founded by St Francis of Assisi in the 13th century.
He teaches science at Keriko Mixed Day Secondary School at Pwani village in Njoro, Nakuru County.
In March, the teacher won the 2019 Global Teacher Prize that came with a $1 million reward.
He is expected to give brief remarks on how he made it to the top in the teaching profession.
Barely a month after being crowned the best teacher in the world, brother Tabichi was appointed champion for children in conflicts and crisis by a global body, Varky Foundation.
He now champions the cause of the 75 million children worldwide whose education is disrupted by conflicts and natural disasters.
The assembly starts its sessions on September 17 and top on the agenda are climate change, universal health coverage and the politics of sustainable development.
There will also be meetings on financing for development, elimination of nuclear weapons and the Sustainable Development Goals (SDGs).
