In her new role, Macpherson-Johnson will be responsible for developing new seafood meal and product solutions for foodservice operators, with a special focus on the needs of restaurant and pub chain operators.
Royal Greenland's aim is to grow its share of the casual dining market and help caterers to offer quality fish options that deliver worthwhile returns.
Randall Jennings, managing director of Royal Greenland UK said: "Rebecca's expertise and experience working with casual dining operators for leading food brands made her an excellent fit for the business and we delighted to have her on board.
“This appointment puts us in a strong position to reinvigorate our product range with new concepts designed to meet our customers' needs.”
Macpherson-Johnson said: "I am thrilled to be joining the business at this exciting time and I look forward to sharing my experience to drive the company forward."