Interpublic Group announced Brian McMahon, a 23-year IPG veteran and founding CEO of Orion, is joining IPG corporate as a senior business advisor. In this new position, Brian will work across the IPG portfolio to foster innovative thinking, with a focus on delivering higher value services to its clients. Brian will also be an advisor to companies participating in its various accelerator and venture programs. Brian joined IPG in 1998 as CEO of Orion. Over the years, he and his team continued to evolve Orion to meet client needs, delivering unique business solutions to IPG clients around the world. During his tenure Brian also oversaw and reshaped various IPG business units, including Newspaper Services of America, Wahlstrom, Rapport, ID Media and BPN, unlocking growth and delivering value to clients domestically and internationally.