Interpublic Group continues to streamline its agency roster with the merger of Minneapolis-based Carmichael Lynch and Philadelphia-based Tierney. 

Carmichael Lynch is the surviving agency and Tierney will become its Philadelphia office effective May 1. In addition to its Minneapolis HQ operation, the agency also has an office in New York.  

Carmichael Lynch CEO Marcus Fischer retains his role post-merger. He has been with the agency for a dozen years and was named CEO in 2017.  

 Mary Stengel Austen, co-founder and CEO of Tierney, is stepping down on March 31 and Tracey Santilli, who Austen appointed President of Tierney in 2022, will continue in that role, reporting to Fischer. The agency was founded 1989 by Austen and Brian Tierney who left about 20 years ago. 

The 62-year-old agency's client list includes brands such as Subaru, Sherwin-Williams, Hostess Brands, Bush's Beans, Post Consumer Brands, and Saputo. 

Tierney’s client roster includes Independence Blue Cross, Cencora, Comcast, McDonald's, Choice Hotels, and TD Bank. 

The merger follows IPG’s sale in January of both Hill Holliday and Deutsch New York to New Zealand holding group Attivo.