She will be based in the new Mediabrands Sydney offices, and will start work on 21 November.
Sharples will report to executive chairman Henry Tajer and will work across all divisions of the business. She is tasked with driving professional development and learning programmes for the group’s 350 employees.
“Sharples has an enviable reputation for driving positive behavioural change through learning and development, facilitation and coaching programmes,” commented Tajer.
Sharples led GroupM's people development programmes for nine years, and most recently has been the principal of her Hong Kong-based business, Activate Expertise.