Maryam Muessel was named product chief investment officer and head of...

Maryam Muessel was named product chief investment officer and head of U.S. fixed income and structured credit at Fortis Investments, Boston. The position is new. She will focus on collateralized debt and loan obligations, said CEO William L. Braman. Ms. Muessel was COO and head of CDO/asset management at ACA Financial Guaranty, New York,where her duties were assumed by others.