Jon Tweedale is a partner in the London office and Co-Head of the International Arbitration Practice.

Jon has over 22 years' experience advising on international commercial disputes and has acted as Counsel for multinationals, banks and governments in international arbitrations under most arbitral rules, including arbitrations under the LCIA, ICC, ICSID and UNCITRAL rules seated in London, Paris and Vienna.  He is recognised as a leading individual in international arbitration by Who's Who Legal – International Arbitration (2021).

Jon is also a Solicitor-Advocate (Civil Proceedings) of the Supreme Court of England and Wales and has substantial experience advising on proceedings in the Commercial Court in London.

Sectors and industries in which he has particular knowledge and experience include energy (oil, gas and renewables), life sciences (pharma and biopharma, including gene therapy programmes), manufacturing and engineering, banking and finance, retail, hospitality and professional services.

Jon represented BP in the first case brought to trial under the Shorter Trials Scheme (a pilot scheme in the English Commercial Court), in which a US$70 million claim against BP was successfully defeated in the Court of Appeal.  More recently, he represented INEOS in a Commercial Court case which provided important guidance on the exercise of a contractual discretion to withhold consent in the context of a commercial contract (Apache North Sea Limited -v- INEOS FPS Limited [2020] EWHC 2081 (Comm)).

Jon studied law at Downing College, Cambridge University, before training and practising as a solicitor in the international arbitration and commercial litigation practice of Allen & Overy LLP (London office) for over 10 years. 

As well as maintaining his practice as Counsel, Jon sits as an arbitrator.

Professional Memberships
  • LCIA
  • ICCA
  • Chartered Institute of Arbitrators

"Jon Tweedale is a virtuoso lawyer at the absolute top of his game. He is an absolutely superb tactician and a fantastic lawyer overall. He has masterly command of the subject and has unrivalled knowledge of the detail of each of his cases. He displays absolute charm with his clients and all those with whom he works. He is very charismatic and clients love him. Most importantly, he gets great results for his clients." 
Legal 500 (2021) - International Arbitration (Testimonials)

"Jon is a leader"

"Jon’s exceptional legal acumen and quick grasp of complex industry practice sets him apart"

"He is proactive, knowledgeable, good at strategy and respects the importance of cost efficiency"

"A good advocate with an incisive legal mind" 
Who's Who Legal - International Arbitration (2021)

“'A good choice for major commercial disputes', Addleshaw Goddard has go-to lawyers for corporate and M&A disputes, commercial contract and termination disputes, complex IT, telecoms and technology litigation, and civil fraud… Jon Tweedale is a 'stellar lawyer who inspires loyalty amongst clients'."
The Legal 500 (2019) – Commercial Litigation (London)

"Jon Tweedale is 'a leading practitioner in the field' who enjoys a strong international reputation for his 'specialist knowledge of arbitration'.  He is described as 'definitely a rising star' and 'a great strategist'."
Who's Who Legal Arbitration: Future Leaders - 2019

Clients endorse Jon Tweedale's "refreshingly straightforward approach" and commend his great ability "to remain abreast of all the relevant issues".
Who's Who Legal Arbitration: Future Leaders - 2018

“‘A delight to work with’, Addleshaw Goddard has a strong track record of acting in major international arbitrations in energy, life sciences, construction and insurance… Jon Tweedale is highly regarded.”
The Legal 500 (2018) - International Arbitration

“Addleshaw Goddard ‘has a stellar reputation; the practice has excellent quality clients that receive the best advice’. The group is regularly instructed in large, high-profile cases in the English courts, with particular expertise in fraud matters, finance litigation and insurance-related disputes…Jon Tweedale is highly rated…”
The Legal 500 (2018) - Commercial Litigation

“Addleshaw Goddard has ‘a strong track record in big-ticket fraud work’, and continues to handle significant bet-the-company cases on behalf of clients,… key figures include Jon Tweedale…”
The Legal 500 (2018) - Civil Fraud