Michael Doak will be leaving Bermudian-based RenaissanceRe Holdings Ltd to launch Griffin Highline Capital, a new private investment firm focused on the insurance industry.Mr Doak is a senior vice-president and portfolio manager for RenRe’s strategic investment portfolio. Kevin O’Donnell, chief executive officer of RenRe, said: “It has been a pleasure to work with Michael over the years. As he transitions to this new opportunity, we thank him for his ongoing efforts and look forward to participating in his future success as an initial investor in his new firm.”