Mwalimu Issaya Bernard Kessy is an Educator who serves as an Academic Master at Archangels Secondary School, a private educational institution located in Kilimanjaro (Moshi Municipal) Tanzania.

Archangels Secondary School is owned and operated by the Congregation of Sisters of Our Lady of Kilimanjaro (Roman Catholic). The school provides education from Pre-Primary School to Secondary School, focusing on fostering creative minds and well mannered citizens. The institution emphasizes values such as respect, honesty, love, excellence and integrity in its educational approach

In this role, Mwalimu is responsible for management of academic affairs, ensuring that the curriculum of the United Republic of the Good People of Tanzania is effectively delivered and that educational standards are upheld. Mwlalimu has also been involved in various initiatives to improve access to education, particularly for girls in Tanzania. His efforts have focused on empowering young generation through education, addressing poverty and promoting sustainable development in his community