ERM, a play sustainability consultancy, completed the acquisition of Shelton Group, a marketing agency. Financial terms were not disclosed. “I am excited about joining ERM as a Partner and leading the next phase of Shelton Group’s evolution. By combining Shelton Group’s sustainability marketing and communication capabilities with ERM’s deep technical subject matter expertise, we will offer a greater depth of service that supports clients with the challenge of communicating their sustainability stories in a clear and compelling way," Suzanne Shelton, Shelton Group President and CEO.