Miller caused a stir last year when she resigned as the chief financial officer of Citigroup to take the same position at Priceline. She quit the Internet firm after less than a year.
At Marsh & McLennan, Miller will be responsible for strategy, administration, communications, e-commerce, finance, human resources and technology at the unit. She starts January 15.
Marsh & McLennan is the world’s largest insurance broker. Its units include the Putnam mutual fund complex and the Mercer Consulting Group.