Yvonne Jefferies - Partner

+44 (0) 20 7842 1661


Yvonne Jefferies is a partner specialising in complex commercial litigation and arbitration disputes often of an international nature. With over 30 years’ experience in her field, Yvonne’s expertise extends to prosecuting and defending civil fraud claims, complex insurance and reinsurance disputes and a wide variety of contractual disputes (often of an international nature). She has in recent years gained particular expertise in disputes involving claims against sovereign states, both in courts and arbitration. 

Ranked as a leading individual her field, she has been described in Chambers 2016 as “an exceptionally talented and fearless litigator who has left no stone unturned in looking at ways of winning the case. She is the kind of lawyer you want to have in a difficult situation”. Yvonne is also an accredited mediator and a Solicitor-Advocate. .

Notable experience

Yvonne’s standout work includes:


Yvonne originally qualified as an Advocate and Solicitor of the Supreme Court of Singapore before joining Freshfields in 1985 as a commercial litigator. She became a partner at Clyde & Co, London in 1991 where she specialised in marine, international trade, commodities and insurance matters before moving with her team to Barlow Lyde & Gilbert in 1997 where she extended her practice to include complex reinsurance matters. Yvonne joined Byrne and Partners in 2009.

News and Articles

Post-Judgment Security for Costs – Has the Court Jurisdiction to Grant it? - 17 June 2016

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