Merkle has appointed Kent Grove to President of its Response Management Group, the Merkle unit that focuses on the nonprofit, government, and commercial sectors. The unit now has more than 640 employees and over 200 clients. He replaces Phil Yamamoto who was appointed to the position earlier this year. Yamamoto succeeded Bill Sayre who was elevated to CEO at the firm in March. Grove is a 15-year veteran of the company, most recently serving in a business development capacity and before that was vice president of client engagement.