Publicis Worldwide is merging two of its New York agencies. The Kaplan Thaler Group and Publicis New York will join to form Publicis Kaplan Thaler, to be headed by the two most senior execs at Kaplan Thaler: Linda Kaplan Thaler and Robin Koval. Joe McCarthy, formerly Publicis New York's chief executive, is leaving. All other employees and clients of the merged agencies are set to remain.