Mantle, who joined Haynes and Boone as a partner in London at the beginning of the month, said his project finance practice, which includes offshore work and large energy-sector deals, is a good fit for his new firm’s London office.
The Dallas-based firm is known as Haynes and Boone CDG in London following its merger with Curtis Davis Garrard of London in 2016.
“I was very keen to join a firm that has energy in its DNA, and therefore a firm like Haynes and Boone,” Mantle said. “I just saw a really good opportunity to join a growing office in London where they were interested in bringing in my capability, which is more on the project finance side.”
Buddy Clark, a partner in Houston who co-chairs Haynes and Boone’s energy practice group, wrote in a press release that Mantle’s experience in high-profile project development and finance projects in Europe, Africa, Asia and elsewhere enhances the services the firm can provide to clients.
Before joining Jones Day in London in 2015, Mantle spent more than 12 years in Toyko as a partner and associate at global firm Ashurst, a stint broken up by five years in Moscow as a partner at SNR Denton, now Dentons.
Mantle declined to identify his clients, but said that over the years he has represented Japanese trading companies and commercial banks, and various private equity and infrastructure firms in the United Kingdom. He also represents companies that develop and operate power and oil-and-gas assets, as well as owners and operators of offshore platforms.
A spokesman for Jones Day did not immediately respond to a request for comment on Mantle’s departure.