Our Team


Prof Brett Cohen

EMAIL Prof Brett Cohen
+27 (0) 72 434 2208
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Dr Philippa Notten

EMAIL Dr Philippa Notten
+27 (0) 82 077 7630
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Dr Yvonne Lewis

EMAIL Dr Yvonne Lewis
+27 (0) 74 243 7408
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Alexandra Logan

Alexandra holds undergraduate and Honours degrees in Earth Science from Stellenbosch University and an MSc in Sustainable Development and Climate Change from UCT. Alexandra’s MSc thesis focused on the sustainability of luxury safari lodges. She is currently involved in projects and research relating to climate change mitigation in South Africa, including the quantitative modelling of emissions projections across the economy. She has also been involved in projects relating to energy efficiency, agriculture, low-emissions development and co-benefits, minerals beneficiation and employment vulnerability due to climate change.

Matthew Burke

Matthew has an undergraduate and MSc in Chemical Engineering. His masters research was in the bioengineering field and included the design of algal reactors to improve growth while ensuring low energy usage. The possibility of carbon capture and utilisation within these systems was considered. Since completing his studies Matthew has worked as a research assistant in the Centre for Bioprocess Engineering Research (CeBER) at UCT with a specific focus on the production of bioenergy through anaerobic digestion and waste water remediation. Since joining The Green House he has been involved in projects relating to greenhouse gas inventory development and reporting, carbon footprinting, landscape approach mitigation planning and municipal training for carbon reporting.


Samantha Galvin

Samantha is our office manager who ensures the smooth running of the TGH office. Samantha comes from an event coordination and accounting background.


Heather Mahachi

Heather holds an Undergraduate and Honours degree in Environmental & Geographical Science and an MSc in Climate Change and Sustainable Development from the University of Cape Town. Heather’s MSc research paper focused on the alignment of climate mitigation and poverty alleviation on a policy level in the Global South. She has a keen interest in sustainability and climate change related issues, particularly in the developing country context. Heather joins the Green House as an Intern under the WWF’s Environmental Leaders Graduate Internship Programme.