Hosanna has lived in Edinburgh since 2003, studying at Napier University and qualifying with an MBA. Hosanna has also obtained an MSc.in Social Development and Health from Queen Margaret University, launching her into the health sector.

In 2008, Hosanna was employed by Terrence Higgins Trust as a Health Trainer for people living with HIV before becoming a Development manager for HIV Scotland. Recognising a huge gap in Africans accessing culturally sensitive organisations, Hosanna founded and led the Hwupenyu Health and Wellbeing Project until her retirement in 2019. 

Hosanna remains very passionate about issues that affect Africans in Scotland especially around sexual health. Hosanna shares, "I do believe that Africans are not hard to reach, the environment needs to enable this group of people to engage with services without making them feel like numbers. One size fits all model does not work when there is a diverse of cultures and languages."