Lockton has promoted Nate Mundy to COO of its US Pacific operations in place of Gary Petrosino, who is retiring after less than two years in the role.
Mundy has been with the firm 13 years and was most recently senior vice president of operations of the Pacific Series.
The executive, who began his career at JLT in London, has held various client service and business development roles at Lockton.
Petrosino joined Lockton as COO of the Pacific Series in April 2016 from Chubb, where he was most recently executive vice president and western US field operations office. His work in the industry spans 40 years.
Tim Noonan, CEO of Lockton's Pacific operations, said Mundy was a "respected leader and innovator who has a keen understanding of Lockton's value to clients".
He added: "Gary Petrosino is a tremendous leader and an industry icon. He has served Lockton, our clients and the industry with integrity and distinction."
Lockton's Pacific operation includes its Los Angeles, San Diego, Orange County, San Fernando Valley, San Francisco, Sacramento, Seattle and Portland offices and houses 600 of the firm's associates across commercial insurance, employee benefits and retirement services.