Arch Capital has promoted Mark Lyons as the chairman and CEO of Arch Worldwide Insurance Group, effective July 2, 2008.

Mr Lyons, who currently serves as president and COO of Arch’s US-based insurance group, will succeed Ralph Jones, who will be retiring at the end of his five-year employment term on July 1, 2008.

Prior to joining Arch, Mr Lyons was executive vice president of product services at Zurich US and vice president and actuary at Berkshire Hathaway Insurance Group.

Mr Lyons holds a BS degree from Elizabethtown College. He is an associate of the Casualty Actuarial Society and also a member of the American Academy of Actuaries.

Dinos Iordanou, president and CEO of Arch Capital Group, said: With Ralph’s guidance over the past five years, our insurance business has continued to establish itself as a significant participant in the worldwide insurance marketplace. We are also confident that Mark will continue to provide the strong leadership necessary to sustain our insurance group’s success.