Dr. Walker joined the staff of KEGS in 1989, in the history department, and quickly took on head of year and head of sixth form responsibilities.
Under his leadership, the school has continued to do exceptionally well in a range of academic, sporting, and other extra-curricular activities, even out-performing the Chelmsford County High School for Girls (another selective school) in some tests.
Dr. Walker had previously taught at Gresham's School.