Walker, who has been CEO of Robus since May 2016, has more than 20 years of experience in the insurance sector.
Prior to starting at Robus, Walker served at Aon in various senior roles in the captive and insurance management practice.
Le Tocq will join from Locate Guernsey. He has led the government initiative since January 2016.
In addition, he holds the role of chairman of Guernsey branch of the Institute of Directors.