Published on 30 March 2026 in Client Alerts

Volterra Fietta promotes Florentine Vos to Counsel

Top-ranked public international law specialist firm Volterra Fietta is pleased to announce the promotion of Florentine Vos to Counsel, effective as of 1 April 2026.

Since joining in 2019, Florentine has worked for the firm’s clients across the full range of public international law, including land and maritime boundary disputes, climate change, international organisations law, the law of the sea, international investment law, space law, sovereign immunities and the laws of war and reparations. 

She has represented clients in multiple State-to-State disputes, including multiple cases before the International Court of Justice.  She has gained a stellar reputation acting for both claimants and respondents in high-stakes, high-profile investment treaty arbitrations.  She also has significant experience advising clients in judicial proceedings involving public international law issues before domestic courts.

As well as being a successful practitioner, Florentine enjoys academic recognition.  She frequently speaks and publishes on a variety of public international law topics.  She lectures at leading universities.  For example, she frequently lectures at the University of Leiden.  She also regularly appears in the media to speak on topical international law issues. 

Commenting on her promotion, Volterra Fietta partner Robert Volterra stated:

“Florentine is already one of the leading public international law practitioners in the world.  During her time at Volterra Fietta, she has worked on multiple cases at the ICJ and as managing associate in a number of investment treaty arbitrations.  Her advisory work for government clients around the world reflects her extensive practical experience over the past decade across the full range of public international law.”

Partner Peter Flint stated:

“Florentine provides advice which is clear on legal principles but which is also tailored to the commercial realities which are the daily concern of our clients.  She is an effective and efficient international disputes practitioner.”

Partner Gunjan Sharma stated:

“Florentine is undoubtedly one of the world’s most knowledgeable and capable public international law practitioners.  Her expertise in the forefront of PIL, from deep seabed mining and space law to investment treaty arbitration and ICJ practice, is second to none.”

Partner Ahmed Abdel-Hakam stated:

“Florentine’s promotion to counsel reflects the trust that our clients place in her leadership in complex investment treaty disputes.  Florentine brings a rare combination of strategic acumen and technical expertise that delivers real results for States and investors alike.  Businesses and States navigating investment treaty disputes will find in Florentine a formidable advocate.”

Florentine said:

“I am delighted to be promoted to counsel at Volterra Fietta.  The firm’s uniquely focused practice and depth of expertise in public international law enable us to engage with the most complex and consequential disputes facing States and private actors alike.  It is a privilege to contribute to that work alongside such a unique and exceptional team.  I look forward to continuing to support our clients with the clear and strategic advice for which the firm is renowned.”

Before joining Volterra Fietta, Florentine worked in the international dispute departments of two major international law firms.  Prior to entering private practice, Florentine worked at an international court and in several international human rights organisations.

Florentine is a qualified Dutch lawyer and has been called to the bar of England and Wales.  She holds a BA and an MA from the University of Cambridge, as well as a BA and an LLM from the University of Leiden.

For further information, please contact info@volterrafietta.com.