Home / People / Penelope Warne
Portrait of Penelope Warne

Penelope Warne

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

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 energy law 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 energy industry in the North Sea, the US, Norway, Brazil, EMEA and Russia.

Penelope is at the cutting edge of energy issues, she is active in thought leadership and trains energy 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.  She is also a member of the Board of the Law Society.

Penelope is ranked as a Leading Energy Expert in both Chambers and Legal 500. She has received many awards for her energy work and has been recognised in The Lawyer's Hot 100 twice. She was also awarded “The Senior Management Partner of the Year” at the British Legal Awards 2017. Penelope was one of only 20 ranked in the law category of The Sunday Times/Debretts “Britain’s 500 Most Influential”. The UK Legal 500 Awards have awarded her for Outstanding Achievement where her role was recognised for leading the firm and her commitment to diversity in the City. Most recently she has been recognised in the 2021 Women Who Will Report as a Change Maker for her strong leadership during the challenges faced through the pandemic, and in Financial News’ Fifty Most Influential Lawyers for 2022.

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


CMS pro­motes 60 to part­ner­ship in re­cord-break­ing year for glob­al pro­mo­tions
In­ter­na­tion­al law firm CMS is pleased to an­nounce the pro­mo­tion of 60 new part­ners, rep­res­ent­ing the firm’s largest-ever glob­al pro­mo­tions round. The ap­point­ments span 33 cit­ies across Europe, the Middle...
In­ter­na­tion­al Wo­men's Day On­line Event
We are de­lighted and priv­ileged to be host­ing "An Audi­ence with Su­z­anne Wil­li­ams QPM" to cel­eb­rate In­ter­na­tion­al Wo­men's Day 2022.  This year’s IWD theme is #Break­TheBi­as - pro­mot­ing a world free of...
CMS named a top UK em­ploy­er for so­cial mo­bil­ity for fifth con­sec­ut­ive year
In­ter­na­tion­al law firm CMS has been named a top UK em­ploy­er for so­cial mo­bil­ity for the fifth con­sec­ut­ive year. The firm has ranked #13 in the So­cial Mo­bil­ity Em­ploy­er In­dex 2021 – CMS’s highest rank­ing...
CMS awards grants to over 70 or­gan­isa­tions in sup­port of UN Glob­al Sus­tain­able...
In­ter­na­tion­al law firm CMS has put its sup­port be­hind over 70 char­it­able and com­munity or­gan­isa­tions as part of its newly launched CMS So­cial Im­pact Fund. Foun­ded this year, the CMS So­cial Im­pact Fund...
CMS an­nounces 52 new part­ners in largest-ever glob­al pro­mo­tions
In­ter­na­tion­al law firm CMS is pleased to an­nounce the pro­mo­tion of 52 new part­ners glob­ally in 2021, span­ning 22 cit­ies across Europe, Lat­in Amer­ica and Africa. The UK ac­counts for 44% of glob­al pro­mo­tions...
ESG Ex­change
Wel­come to ‘ESG Ex­change’ - con­ver­sa­tions about the real world im­plic­a­tions of ESG to help man­age busi­ness risk and identi­fy op­por­tun­it­ies. ESG (en­vir­on­ment­al, so­cial and gov­ernance) is­sues are in­creas­ingly...
CMS UK at­tains CDP’s A- score for cli­mate ac­tion and sus­tain­ab­il­ity pro­gramme
CMS UK is pleased to an­nounce that it has been awar­ded a score of A- by CDP in re­cog­ni­tion of its con­tinu­ous ef­forts to tackle cli­mate change is­sues as part of its Cli­mate Ac­tion and Sus­tain­ab­il­ity pro­gramme. The...
Why CMS for ESG leg­al ad­vice?
Why CMS? In short, be­cause we have the right ex­per­i­ence, the right ap­proach and the right am­bi­tion. Se­cur­ing a sus­tain­able fu­ture for our cli­ents The firm’s in­ter­na­tion­al scope, sec­tor­al fo­cus and...
Penelope Warne se­cures second term as The Seni­or Part­ner
Glob­al law firm CMS is pleased to an­nounce the re-elec­tion of Penelope Warne as The Seni­or Part­ner of CMS UK LLP, fol­low­ing a vote by the firm’s part­ner­ship. This will be Penelope’s second term, ef­fect­ive...
CMS is a Times Top 50 Em­ploy­er for Wo­men 2019
In­ter­na­tion­al law firm CMS is de­lighted to be re­cog­nised as a Times Top 50 Em­ploy­er for Wo­men for the fourth con­sec­ut­ive year.The Times Top 50 Em­ploy­ers for Wo­men is the UK’s most highly pro­filed and...
CMS takes home coveted ‘Law Firm of the Year’ award at Brit­ish Leg­al Awards
CMS was named Law Firm of the Year at the pres­ti­gi­ous 2018 Brit­ish Leg­al Awards, held on 29 Novem­ber in Lon­don. The firm saw off strong com­pet­i­tion from a line-up of firms in­clud­ing Clif­ford Chance, DLA...
IBA An­nu­al Con­fer­ence 2018
Sev­er­al of our part­ners will be at the IBA An­nu­al Meet­ing in Rome, Italy, rep­res­ent­ing a range of jur­is­dic­tions, prac­tice areas and sec­tor spe­cial­isms. To ar­range a meet­ing dur­ing the IBA, please con­tact...