Born in Lagos and raised between Lagos and Dublin, Ireland; Professor Lesi’s academic foundation was laid at the College of Medicine, University of Lagos (CMUL), where he earned his MBBS degree in 1984. He further honed his expertise at Lagos University Teaching Hospital (LUTH), attaining the Fellowship of the West African College of Physicians in Paediatrics (FWACP (Paed.)) in 1994. His quest for academic excellence led him to University College London, where he obtained a Master’s degree in Mother and Child Health with distinction in 1997. In recognition of his contributions to medicine, he was awarded the Fellowship of the Royal College of Physicians of London (FRCP) in 2011 and later served as an International Adviser to the Royal College.

A seasoned academic with over 29 years of experience, Professor Lesi has mentored generations of undergraduate and postgraduate students across various health disciplines. His research, with more than 60 publications in reputable journals, has significantly impacted Paediatric Neurology and Child Development. His passion for education extends beyond research, as he has played a pivotal role in curriculum development, ensuring that medical training at UNILAG aligns with global best practices.

Professor Lesi’s track record in leadership and administration is as remarkable as his contributions to academia. His past roles include:
* Secretary of the Paediatric Association of Nigeria
* Secretary-General of the West African College of Physicians
* Chairman of the Medical and Dental Consultants Association of Nigeria (LUTH Branch)
* Deputy Chairman of the Medical Advisory Committee at LUTH
* Acting Head, Department of Paediatrics
* Dean, Faculty of Clinical Sciences
* 14th Provost, College of Medicine, UNILAG
* Chairperson of the Medical and Dental Council of Nigeria (MDCN).
His tenure as Provost was marked by strategic reforms, infrastructural development, and improved governance structures. As a firm believer in teamwork and innovation, he has consistently championed policies that drive institutional growth while upholding the highest standards of integrity.