NEW YORK — Merrill Lynch & Co. on Thursday announced several executive changes in its Americas investment management unit.

Mary E. Taylor, previously senior vice president of human resources for Merrill Lynch, was named co-head of the unit with Robert C. Doll, who is also the unit’s chief investment officer. Mr. Doll will focus primarily on the retail investment management business, while Ms. Taylor will run the unit’s institutional business.

Paul Galietto, the unit’s head of sales, has taken on the additional title of chief operating officer for its retail business. Frank Salerno is to be chief operating officer for its institutional business.

Hannah Grove, who was previously head of retail marketing, has been named chief marketing officer for the Americas. Her new job encompasses both retail and institutional marketing. Martin Andrew, who was head of institutional marketing for the Americas, is taking a post in London as chief operating officer of the private investors group within the investment managers division that covers Europe, the Middle East, and Africa.

Evelyne Estey has been appointed head of the Americas unit’s ultra-high-net-worth business, which targets people with at least $10 million to invest.

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