He will be based in both London and Manchester, and has been tasked with overseeing the employee and change management practice of the agency.
This arm of Weber Shandwick works with clients to manage their reputation and staff.
Morris joins the agency from an in-house position at Williams & Glyn bank where he led the company's people strategy and culture.
At Weber Shandwick, he will report to Jim Donaldson, executive president of corporate comms for the EMEA region.
Donaldson said: "Dave’s blend of in-house and consulting experience working with some of the world’s leading brands is a welcome addition to the team. His leadership and expertise will help support and drive the continued growth of the practice and extend the support we offer to clients."