OneBeacon Insurance Group has appointed Dennis Crosby as the new president of OneBeacon Excess and Surplus Lines, the company's newest business unit.

Mr Crosby most recently was president and CEO of ACE Westchester and chairman of ACE Commercial Risk Services, where he was accountable for wholesale distribution of specialized property and casualty products within excess and surplus lines marketplace.

Prior to that, Mr Crosby has worked for 23 years with St Paul Travelers in a variety of senior roles including commercial middle market, insurance operations and public sector services.

Kevin Rehnberg, executive vice president of specialty lines at OneBeacon, said: “We are pleased to welcome Dennis to OneBeacon. His specific experience, leadership talents and successful track record will be instrumental in building our newest specialty business.”

Mike Miller, CEO of OneBeacon, said: “I am pleased to have Dennis join our leadership team and look forward to working with him once again. Going forward, we will continue to look for opportunities to grow the value of our company by adding to our specialty capabilities.”