Hamilton Insurance Group CEO Brian Duperreault will add “chairman” to his title, the Bermuda-based property/casualty insurance and reinsurance holding company has disclosed.

The leadership tweak is taking place to address the departure of Sandy Weill, the former Citigroup CEO and Hamilton’s board chairman since January 2014, who retired from that slot effective immediately, according to the Feb. 17 announcement.

Weill began as Hamilton’s chairman one month after its formation. Hamilton credited Weill with helping to push for the strategic relationship between Hamilton’s executive team and Two Sigma, Hamilton’s technology and investment partner.

Duperreault credited Weill with being “instrumental in Hamilton’s market launch” and using his “extensive experience and balanced judgment” to help grow the company.”

“I will always be grateful to him for believing in Hamilton’s potential, and look forward to his wisdom and counsel as a consultant to the company,” Duperreault said in prepared remarks.

Weill’s other board affiliations include chairman emeritus of Citigroup, president of Carnegie Hall and chairman emeritus of Weill Cornell Medicine.

Duperreault has been an active proponent of bringing technology improvements to property/casualty insurance and attracting more millennial employees to unlock its potential. He is part of a collection of industry groups and executives who are trying to coordinate these efforts, most recently with February’s Insurance Careers Month and YouTube testimonial videos that kicked off the effort.

Source: Hamilton Insurance Group