[4][5] She began her career in Child and Adolescent Psychiatry and mental health in 1986 at the University College Hospital (UCH), Ibadan.
She had further residency training first in General Psychiatry, and then Child and Adolescent Psychiatry at the Lancaster Moor Hospital, Lancaster, and the Queen’s Park Hospital, Blackburn, in the United Kingdom.
Olayinka also had training in Family Therapy at the Department of Family Studies, University of Pennsylvania, Philadelphia, and was also a visiting scholar at the University of Pennsylvania's Bipolar Research Unit.
She studied at the Nuffield Institute for Health, University of Leeds where she had her Masters in Public Health in 1999, through the University of Ibadan MacArthur Foundation-funded Staff Development Programme.
[6] Olayinka has written numerous articles for both local and international journals.