She then trained as a paediatrician at the UCL Great Ormond Street Institute of Child Health and the Donald Winnicott Centre, both in London.
After she completed her training in Nigeria, she faced a choice between either following a purely academic career or becoming a social entrepreneur, deciding to take the latter path.
She later formed the Nigerian Dyslexia Association and then combined it with HING into the Centre for Healthy Start Initiative in 2011.
[4] According to Olusanya, the main causes of hearing loss in Nigeria were electricity generators, prescription antibiotics and the continual presence of noise.
[5] Olusanya is a director of Global Research on Developmental Disabilities Collaborators (GRDDC), a group of paediatric experts funded by the Bill and Melinda Gates Foundation and the Institute for Health Metrics and Evaluation.