Porter Novelli didn't immediately respond to a request for comment.
Although the firm recently added a much-needed piece of new business with LG Mobile, it's had a tough year.
The firm, smaller than siblings Fleishman-Hillard and Ketchum, has cut a number of positions and lost a raft of senior-level talent in the past several months. In October, 20-year client Gillette dealt the shop a blow when it announced it was moving its account to Ketchum. A few months later, former President Julie Winskie departed after 25 years.
More recently, Michael Goldberg, who joined the firm as CMO only last October, announced that he was stepping down to rejoin the creative agency world as partner and chief marketing officer at Deutsch, New York.
Mr. Stockman joined the firm in 2000, according to his LinkedIn profile.