Picture of Penelope Warne

Penelope Warne

The Senior Partner
Chairman of the UK LLP Board and Head of Energy

CMS Cameron McKenna Nabarro Olswang LLP
Cannon Place
78 Cannon Street
United Kingdom
Languages English, French

Penelope Warne is the Senior Partner and Chairman of the UK Board. She is also Head of Energy.

Penelope, an oil and gas specialist, joined the firm in 1993 to set up the Aberdeen office and has a strong growth track record. In 25 years, she has transformed CMS’ practice in Scotland from one person in Aberdeen to the market leading practice in Scotland following the combination with Dundas & Wilson in 2014. As the Energy practice group leader, she opened offices in Aberdeen, Edinburgh, Brazil, Mexico and Dubai. Her practice spans the globe advising clients in the oil and gas industry in the North Sea, the US, Norway, Brazil, EMEA and Russia.

Penelope is at the cutting edge of oil industry issues, she is active in thought leadership and trains oil industry lawyers in her role as an Honorary Fellow and Trustee of the Centre for Energy, Petroleum and Mineral Law and Policy at Dundee University. She is also a member of the Foundation Board at IMD, the highly acclaimed international business school based in Lausanne, Switzerland. CMS runs its Partner Induction Programme in conjunction with IMD and also runs a scholarship programme for associates to secure places on IMD’s Building on Talent programme. 

Penelope is ranked as a Leading Energy Expert in both Chambers and Legal 500. She was also ranked in “The Sunday Times Britain’s 500 Most Influential” in 2015 and also in 2016 as one of only 20 in the law category. She was awarded 'Best in Energy, Natural Resources and Mining' at Euromoney's Europe Women in Business Law Awards in 2012 and 2013, and has been recognised in The Lawyer's Hot 100.

Penelope works globally with governments, energy industry specialists and academics and is a member of the Oxford University Vice Chancellor's Circle.

Penelope is a great supporter of Diversity & Inclusion and is proud to lead the fundraising in the firm.

more less


Bristol University.

Dually qualified in English and Scots law.

more less



Show only
CMS announces 31 partner and two director promotio...
Iran’s new petroleum contract
This January marks the first anniversary of the “Implementation Day”: the day on which nuclear-related sanctions against Iran were lifted under the Joint Comprehensive Plan of Action (“JCPOA”). The lifting of sanctions has been particularly good news for Iran’s.
CMS’ London HQ wins ‘Best Fit out of Workplace 201...
CMS named in The Times as a Top 50 Employer for Wo...
CMS wins Best Managed International Law Firm at MP...
Penelope Warne recognised for second consecutive y...
CMS expands The University of Law programme to int...
CMS’ Athena Project showcases at Birkbeck
CMS adds 39 partners across the firm
CMS strengthens International Arbitration and Ener...
Die Zeit and CMS forum in Davos: experts discuss t...
Frankfurt, 27 January 2015.
Penelope Warne recognised as one of “Britain’s 500...
Client feedback report 2013/14
Acting on feedback...
Today Dundas & Wilson joins CMS, the sixth largest...
CMS opens new office in Oman, strengthening Middle...
Penelope Warne today takes up the role of Senior P...
CMS ranks as one of top three law firms in leading...
Leading oil & mining experts converge to discuss t...