Grierson has experience in organising a range of different events, including experiential campaigns, product launches, automotive customer and dealer events and gala events.
He has worked across the retail, sports, automotive, travel, finance, and commercial sectors, with brands such as Rolls-Royce Motor Cars, Nissan and Unilever.
Commenting on his appointment, Grierson said: "It is a real privilege to join an industry leading company like drp. I am relishing the opportunity of working in a fully-integrated environment with some of the best talent and most exciting clients in the sector."
Drp plans to continue to expand its team over the next 12 months, across all areas of the business.
Last month the agency promoted Callum Gill to the role of head of client insight and innovation, and Ryan Curtis-Jonhson was promoted to the role of head of PR and marketing back in January.