Curtis, Mallet-Prevost, Colt & Mosle LLP is notable for its long-standing representation of governments, national oil companies, and regulators in the oil and gas sector. The firm advises on licensing rounds, model documentation, and increasingly supports energy transition initiatives, including hydrogen projects. Marc Hammerson focuses on M&A, project development, and restructuring in the oil and gas industry. Odysseas Stergianopoulos specialises in international arbitration and litigation, frequently representing sovereign states and state-owned entities in energy-related disputes.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Lawyer & team quality
Client satisfaction: Billing & efficiency
Client satisfaction: Sector knowledge
Client satisfaction: NPS ®
Testimonials
Collated independently by Legal 500 research team.
‘The team led by Marc Hammerson is highly regarded for its expertise in oil and gas M&A. They combine strong technical capabilities with a deep understanding of the commercial and strategic drivers behind complex energy transactions, particularly in the upstream space.'
'The team is known for its pragmatic advice, responsiveness, and ability to manage cross-border matters efficiently – making them a trusted advisor on high-value and strategically important deals.’
‘Marc Hammerson is a standout practitioner in oil and gas M&A – commercially astute, technically excellent, and highly experienced in navigating complex cross-border transactions in the energy sector.’
‘The energy practice is distinguished by its deep expertise in the oil and gas sector. Their team possesses a profound understanding of the industry's regulatory landscape, commercial dynamics, and technical complexities.'
'With extensive experience handling high-stakes transactions, negotiations, and disputes, they consistently deliver strategic, forward-thinking solutions tailored to the evolving challenges of the global energy market. Their ability to navigate complex legal frameworks and craft innovative strategies has proven invaluable.’
‘Marc Hammerson has a real-world understanding of oil and gas projects work, and a depth of experience which I feel fortunate to be able to access.’
Key clients
- Petróleo Brasileiro S.A.
- Republic of Uganda
- Republic of Kazakhstan
- RAKGAS LLC
- First Hydrocarbon Nigeria
- Kanga Potash
- Harps Holdings Pte Limited
- ACAM LP
- Gaza Power Generating Company LLC
- ACP Energy Plc
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Practice head
Marc Hammerson
Other key lawyers
Odysseas Stergianopoulos