Grand Central Marketing has promoted Jennifer Guillette to vice president.

She joined the agency in 2004, working most recently as account director. In addition to heading new media initiatives for such clients as Samsung, Intel, Ragdoll and Windstream, she has also led numerous campaigns for Warner Bros., including the recently opened Tweety Boutique in Beverly Hills, CA. Guillette is based in Los Angeles.

In other news, the agency has hired Adam Rosen as account director and Eric Blumenfeld as account manager.

Most recently, Rosen worked for Warner Bros. as an operations manager in the special events division producing such affairs as the CW launch party, the “Friends” series finale party, and “The Last Samurai” premiere party. At Grand Central Marketing, Rosen will be managing programs for Warner Bros., Diageo and General Growth Properties.

Blumenfeld joins the agency from ESPN where he worked on large-scale, multi-media campaigns for the National Basketball Association playoffs, numerous college sports properties, ESPNU, ESPNEWS, ESPN The Magazine and ESPN Radio. In his new post, he will work on promotions for Del Monte, Starwood and The Wall Street Journal.