Our team of multidisciplinary and highly experienced consultants are committed to providing expert health economics advice and insights.

Dominic Tilden
Dominic Tilden Director
Dominic Tilden is a health economist with over 20 years practical experience in the design, development and implementation of health economic evaluations.
Mia Mudge
Mia MudgeAssociate Director
Mia joined THEMA in 2007 and has worked as a consultant in health economics and outcomes research since 2003.
Suzi Cottrell
Suzi CottrellSenior Partner
Suzi began at THEMA in 2008 after working as a senior consultant and manager in health economics and outcomes research in the UK.
Dan Jackson
Dan Jackson Senior Partner
Dan has over 20 years’ experience in health economics, working in both Australia and the UK. He joined THEMA in 2009.
Koji Makino
Koji MakinoSenior Partner
Prior to joining THEMA in 2010, Koji worked as an evaluator on behalf of MSAC for the Commonwealth Department of Health and Ageing.
Lara Aghajanian
Lara AghajanianSenior Partner
Before joining THEMA to pursue health economics in 2016, Lara gained extensive experience as a clinical pharmacist.
Will Sierakowski
Will SierakowskiSenior Partner
Will joined THEMA in 2016 where he has excelled in health economics evaluation and the development of reimbursement applications.
Carmel Guarnieri
Carmel GuarnieriSenior Analyst
Carmel is a market access professional with over 15 years consulting experience in Australia and the UK.
Joshua O’Malley
Joshua O’MalleySenior Analyst
Josh worked as a Senior Value Analyst for a global healthcare value and market access consultancy before joining THEMA in 2020.
Tahlia Seage
Tahlia SeageSenior Analyst
Tahlia joined THEMA in 2021 and has since contributed to health technology assessments and reimbursement applications for a range of therapeutic areas.
Mia Ratkovic
Mia RatkovicSenior Analyst
Mia worked as a Data Scientist and Junior Economist before joining THEMA in 2022, having studied both Economics and Medical Science (Hons I).
Bethany Mountford
Bethany MountfordSenior Analyst
Beth joined THEMA in March 2025 having spent three years as a Senior Associate in HEOR and Market Access at a global health economics consultancy in London.
Sahibnoor Singh
Sahibnoor SinghAnalyst
Sahibnoor joined THEMA in 2023 after completing her Bachelor of Science and Master of Public Health, specialising in Communicable Disease Control at the University of Sydney.
Fearghal Comaskey
Fearghal Comaskey Analyst
Prior to joining THEMA in 2024, Fearghal studied Microbiology and Bioinformatics, previously working in HTA in Ireland.
Ben Karnon
Ben KarnonAnalyst
Ben began at THEMA in late 2024 after completing his Master’s in Health Economics at the University of British Columbia and Bachelor of Economics with Honours in Public Health from the University of Adelaide.
Harpreet Singh
Harpreet SinghAnalyst
Harpreet joined THEMA Consulting in 2025 with prior experience as a health economist for a market access consultancy in Sydney.
Abby Moran
Abby MoranAnalyst
Abby joined THEMA in December 2025 holding a Bachelor of Science (Medical Science) and a Bachelor of Business from the University of Technology Sydney.
Juliet Slack-Smith
Juliet Slack-SmithIntern
Juliet is completing a Bachelor of Economics and Bachelor of Advanced Studies at the University of Sydney, majoring in Economics and Political Economy.