Ms. Rosenberg spent 17 years at Serino Coyne. She began as assistant to principal Matthew Serino in May 1990, later moving up to coordinator for the agency's fledgling corporate press division. That year, she performed a comic monologue of her own writing at the Serino Coyne Christmas party. CEO Nancy Coyne noticed and Ms. Rosenberg was promoted to junior copywriter. She later advanced to copywriter, senior copywriter, and, in 2002, to her position as one of the agency's creative directors. "Ruth Rosenberg was so much more than just a creative director at Serino Coyne," said Ms. Coyne in a statement. "She was Broadway's favorite, a producer's best friend. Every show she 'sold' she sold from the heart. Her agency family is so very diminished by her loss. And the theatre will be missing the sweetest cheerleader it ever knew."

Ms. Rosenberg's many accounts include the currently running Wicked, The 25th Annual Putnam County Spelling Bee, Mamma Mia!, Beauty and the Beast, A Chorus Line, Talk Radio, and Disney's upcoming The Little Mermaid.

Rosenberg is survived by her mother, Ellen Rosenberg, two sisters and two brothers.