Pinsent Masons hires investor-state arbitration specialist in London
01 Mar 2023 | 09:50 am | 1 min. read
Multinational law firm Pinsent Masons has hired partner Sylvia Tonova to the firm’s International Arbitration Practice.
Sylvia is a highly experienced international arbitration lawyer and has extensive experience in both international commercial and investment treaty arbitration focussing on complex, high-value disputes, often in the context of high-profile and politically sensitive projects and transactions. Sylvia will co-lead the firm’s investor-state dispute settlement and public international law team.
She is dual qualified in England and the US (New York and Washington DC). Sylvia represents clients under all the major arbitration rules and advises clients on investment treaty disputes, sovereign immunity, and managing political risk.
Sylvia joins from Jones Day where she has led on arbitrations in Europe, the Middle East, Africa, Latin America, and Asia. She also sits as an arbitrator and was appointed to the ICSID Panel of Arbitrators for a six-year term in 2016.
Jason Hambury, global co-head of Pinsent Masons’ International Arbitration Practice, said: “Sylvia’s skillset is a perfect fit with our leading arbitration practice. Our clients will benefit from her experience working on complex cross-border commercial and investor-state disputes, across numerous sectors, such as energy, mining and telecoms. Sylvia will play a significant role in the continued success of our practice and we are delighted to welcome her.”
Sylvia has been recognised in Legal 500, Who’s Who Legal and Chambers as being a leading individual in international arbitration.
Sylvia said of her appointment: “I am thrilled to join Pinsent Masons and co-lead the investor-state dispute settlement and public international law team. Investment treaty law plays a pivotal role in the political risk strategy of cross-border investors, particularly in the energy, mining and infrastructure sectors. I look forwarding to helping clients resolve their politically sensitive disputes and joining a team highly regarded for its deep sector knowledge and world-class reputation in handling high-value, complex arbitrations.”
Key Contacts
Latest press releases
Show me all press releasesPinsent Masons hires leading IP partner duo Kai Ruting and Philipp Widera in Germany
Multinational law firm Pinsent Masons has appointed intellectual property (IP) partners Dr. Kai Rüting, LL.M. and Philipp Widera, LL.M. to join its Düsseldorf office.
Pinsent Masons advises Sports Entertainment Group on capital raising and acquisition of MediaWorks
Multinational law firm Pinsent Masons has advised Australian multi-content and entertainment business Sports Entertainment Group Limited (ASX: SEG) on a capital raising to help fund the acquisition of MediaWorks Topco Limited, New Zealand’s largest audio business and third largest advertising platform across all media, as well as on all Australian aspects of the acquisition, including associated ASX regulatory requirements.
Pinsent Masons announces FY26 results
Multinational law firm Pinsent Masons has today announced its unaudited financial results for the year ending 30 April 2026. The firm has generated a revenue increase of 3.3% to £703m. Profit per equity partner is £740k.
People who viewed this press release also viewed
Show me all press releasesPinsent Masons hires leading IP partner duo Kai Ruting and Philipp Widera in Germany
Multinational law firm Pinsent Masons has appointed intellectual property (IP) partners Dr. Kai Rüting, LL.M. and Philipp Widera, LL.M. to join its Düsseldorf office.
Pinsent Masons announces FY26 results
Multinational law firm Pinsent Masons has today announced its unaudited financial results for the year ending 30 April 2026. The firm has generated a revenue increase of 3.3% to £703m. Profit per equity partner is £740k.
Pinsent Masons advises EDF power solutions and ESB on strategic partnership with Sumitomo Corporation in Gwynt Glas Offshore Wind Farm
Multinational law firm Pinsent Masons has advised EDF power solutions and ESB on the sale of a one-third interest in the Gwynt Glas Offshore Wind Farm to Sumitomo Corporation, marking an important milestone in the development of one of the UK's most significant floating offshore wind projects.
For all media enquiries, including arranging an interview with one of our spokespeople, please contact the press office on
Location contacts
Europe: [email protected]
Asia: [email protected]
Middle East: [email protected]
Australia: [email protected]