Roll Call: Changes at Porter Novelli, Weber Shandwick, Walt Disney, and More

Porter Novelli has restructured its global healthcare practice. Barbara DeBuono, the firm’s chief medical officer, will lead the practice as global director of health and social marketing. And there are four new hires in New York and London: Susan Hayes returns to the firm to serve as partner, managing the Novartis business; Cheryl Nifro joins as EVP to lead the Merck business; Kimberly Santiago joins the London office as associate director to handle men’s health brands; and Sarah Schapira joins the London office as account director to work on women’s healthcare brands.

Stephanie Agresta has joined Weber Shandwick as EVP, MD of social media in the digital communications practice. She was previously EVP and global director of digital strategy and social media at Porter Novelli. Her first book, Perspectives on Social Media Marketing, co-authored with PepsiCo’s Bonin Bough was released this month.

GCI Health has appointed Mark Davis as head of the Digital Health team. He was previously director of social media at Novartis Pharmaceuticals.

Mark Cater has rejoined Cohn & Wolfe as president of the firm’s New York office, effective November 22. The office is the firm’s largest and serves as the global HQ. Cater was previously director of C&W’s EMEA region.

Nicolas Bouvier has joined APCO Worldwide as deputy MD of the Paris office. He was previously an EVP at Edelman.

Deadline Hollywood reports that John Nicoletti is stepping down as VP of global communications at The Walt Disney Studios to take a position with Walt Disney Parks and Resorts. He will be replaced by Paul Roeder.

Former Yahoo VP David Mandelbrot has joined Tynt Multimedia as chief business officer. He spent seven years with Yahoo.