experience, understanding and a unique perspective
founders
Dr Rachel Gavey (She/Her) Commercial Director
Rachel is Co-Founder and Commercial Director of sustain:able, where she works with companies, investors, lenders and insurers to translate climate, environmental and ESG risk into clear, decision-ready insight.
With over 20 years’ experience across the energy and infrastructure sectors, Rachel specialises in climate and transition risk, regulatory-driven disclosure, and the practical integration of sustainability into organisational risk reduction, financing requirements and insurance decisions.
Rachel has advised operators, developers, private equity-backed companies and financial stakeholders across oil & gas, offshore wind, CCS, maritime and emerging technologies. She is known for bringing technical depth together with commercial realism, focusing on what matters most to strategic committees, risk teams, insurers and boards.
Rachel holds a PhD in Marine Geology and has an academic background spanning geology, oceanography and environmental systems, alongside deep hands-on industry experience as a geologist and project manager.
Now based between the UK and Saudi Arabia, Rachel works internationally with clients navigating increasing regulatory pressure, lender-driven ESG requirements and insurer scrutiny, helping them move from reactive compliance to defensible, finance-ready sustainability strategies.
Dr Rosalie Constable (She/Her) Technical Director
Rosalie is Co-founder and Technical Director of sustain:able and works at the intersection of regulation, risk, finance and sustainability in energy and materials sectors.
Her focus is on helping organisations understand and manage sustainability-related risks that affect compliance, capital allocation and insurability.
Rosalie holds a PhD in Earth Science and has over 20 years’ experience across technical, asset management and leadership roles in the oil and gas industry. Her background spans the full asset lifecycle, providing a practical understanding of how regulatory requirements, emissions, environmental risk and operational realities interact in decision-making.
She has specialist expertise in risk and exposure analysis, emissions accounting and transition planning, and supports organisations facing regulatory scrutiny, financing requirements and insurance review. Her work is grounded in producing defensible, decision-relevant analysis rather than standalone ESG reporting.
Rosalie has completed formal training in Transition Engineering, focused on practical system-level transition under real-world constraints, and holds ISO 14064-1 and 14064-2 certifications in greenhouse gas emissions accounting and emissions reduction projects.
Rosalie is based near Cambridge in the UK and her experience across global energy projects underpins sustain:able’s focus on risk-based sustainability support for regulated, capital-constrained organisations.
core team
Our wider team at sustain:able includes technical experts from geoscience, engineering, data analysis, commercial and finance backgrounds with experience working in the energy and materials sectors.
We bring together the right people for each project, to ensure a systems view is taken to deliver value every time.
.png)
certifications & memberships
Dr Rosalie Constable completed the University of Canterbury course in Transition Engineering: Interdisciplinary Transition Innovation, Management and Engineering (InTIME©). She is also a member of the Global Association for Transition Engineering.
Our expert emissions team is ISO 14064 certified.
We are signed supporters of the Methane Emissions Initiative.
sustain:able are proud members of OEUK, the leading representative body for the UK offshore energy industry.
