McGraw-Hill Cos. named Jack Callahan as its chief financial officer, succeeding Robert Bahash who was appointed president of McGraw-Hill Education, the company said Monday. The changes are part of its decision to operate Standard & Poor's credit ratings segment separately from McGraw-Hill Financial which will include S&P Indices and Capital IQ. The realignment will allow S&P to focus on providing enhanced credit risk benchmarks and research, McGraw-Hill said. Bahash will replace Peter Davis who has left the company to pursue other career opportunities.