 JACKSONVILLE, Fla.--BUSINESS WIRE--Rayonier Advanced Materials Inc. NYSE:RYAM the Company announced changes to the management structure in its High Purity Cellulose segment and Pulp business. Dr. Christoph Koenig will assume responsibility for all High Purity Cellulose sales, while Tomas Fernandez will assume responsibility for marketing and customer service, sustainability, high yield pulp and lignin sales, research and development, and other strategic growth initiatives. Dr. Christoph 