Hill, Holliday, Connors, Cosmopulos has named Nancy Harhut, 46, and Mark Mylan, 43, managing directors of its relationship marketing division. Harhut has been at the Boston agency for more than two years as executive creative director of the direct marketing group. She was named Direct Marketer of the Year in New England in 2004. Mylan has been at Hill, Holliday for almost seven years as director of client service for direct marketing and strategy. He previously worked at Young & Rubicam in New York as the integrated team leader on the Sears account.