Dr Mortby is a senior research fellow in the School of Psychology, Faculty of Science, UNSW. She holds a conjoint appointment with Neuroscience Research Australia (NeuRA) and is an Associate Investigator of the UNSW Ageing Futures Institute.

Dr Mortby was awarded her PhD with Laudatio Magna Cum Laude from the University of Zurich, Switzerland (2012). During her post-doctoral research, she retrained in advanced neuroimaging techniques to complement her research skills in psychology. She is the current funded by a Dementia Centre for Research Collaboration Mid-Career Research Fellowship (Dementia Australia Research Foundation) and previously held an NHMRC-ARC Dementia Research Development Fellowship and an Alzheimer's Australia Dementia Research Foundation Post-doctoral Fellowship. 

Dr Mortby is the recipient of the 2015 New Investigator Award for demonstrated research commitment to the field of Neuropsychiatric Symptoms in dementia by the Neuropsychiatric Syndromes in Neurocognitive Disorders, a Professional Interest Areas (NPS PIA) of ISTAART (the US Alzheimer’s Association International Society to Advance Alzheimer’s Research and Treatment). She currently serves as the elected Chair of the executive committee of the NPS PIA of ISTAART and as the Chair of its Apathy Working Group. She is also the inaugural co-Chair of the International Society for CNS Clinical Trials and Methodology (ISCTM) Strategies to Improve Recruitment for Clinical Trials Targeting Neuropsychiatric Symptoms in Memory Disorders Working Group.