Currently, she is a PhD candidate at the University of Nairobi specializing in Tax. Her research revolves around international tax, fiscal policy, and illicit financial flows.

Mary has had a diverse and rich career, beginning as a Tax Advisor at KPMG in the United Kingdom and then working as an Employment Taxes Advisor at Zurich Insurance in the United Kingdom. She has since worked for Strathmore University as a Doctoral Fellow, University of Nairobi as a Tutorial Fellow and at Dentons Hamilton Harrison & Mathews as a Tax Associate. 

She has also served as the Vice Chair of the Committee on Fiscal Studies housed under the University of Nairobi where she was responsible for conducting research on international tax, identifying funding opportunities, capacity building and mentoring young researchers. 

As an independent consultant, she has conducted research on tax and gender, tax treaties, tax and human rights and taxpayers’ rights among others and she is dedicated to tax law and policy research.