Mr. Callahan served as general counsel of Oxbow Carbon LLC, headquartered in West Palm Beach for 29 years, before retiring in 2013.  He was affiliated with William I. Koch in his successful defense of the America’s Cup in 1992. Mr. Callahan is the past president of the Palm Beach membership of the Hospice Foundation and past chairman of the board of Hospice of Palm Beach County Foundation. He is also on the board of Oxbow Carbon LLC and prior board member of Oxbridge Academy.  Prior to joining Oxbow, Mr. Callahan practiced law in Boston. He is a graduate of Georgetown University and Suffolk University Law School.