Bruce Smith, Marvin's Magic demonstration training manager has been entertaining crowds at Hamley's for 30 years.
The closing, which will take place in phases through the rest of the year, will affect around 100 employees.
She replaces Mark Hoijtink who has decided to leave Hasbro after 11 years in order to pursue new opportunities.
Aldridge took up his position on April 1, just 12 months after joining the company in 2017. He will be supported by Smith in a consultancy role until September 2018.
The firm's trade marketing manager will compete to raise money for the Juvenile Diabetes Research Foundation.