Allen & Overy's London office
Allen & Overy’s London office (courtesy photo)

Allen & Overy London arbitration partner Jeffrey Sullivan is joining Gibson Dunn & Crutcher.

Sullivan will join Gibson Dunn’s international arbitration team as a partner in London. He has spent more than a decade at Allen & Overy, making partner at the magic circle firm in 2013.

Sullivan specializes in international commercial and investment treaty arbitration and is both U.K. and U.S. qualified. While at Allen & Overy, he advised more than 25 investors on eight arbitration claims against Spain relating to the regulation of the Spanish renewable energy sector, involving claims worth more than €2.5bn ($2.85bn). He also previously spent five years as an associate at Foley & Lardner.

“Given the prevalence of investment treaty disputes and the inclusion of arbitration clauses in large commercial transactions and investment ventures, we believe this is an area of increasing importance to our clients,” said Gibson Dunn chairman and managing partner Ken Doran.

Gibson Dunn has been on a recruitment spree in Europe in recent months. In June, the U.S.firm hired Herbert Smith Freehills global energy co-head Anna Howell in London, while the same month, it recruited four partners and one counsel from Ashurst’s Paris base.

Meanwhile, Allen & Overy has focused predominantly on lateral hires in the U.S. Earlier this year, the firm recruited a three-partner New York finance and securities team from Paul Hastings, as well as a former federal prosecutor at the Southern District US Attorney’s office from white-collar boutique Morvillo.