Kenniston was the Home Secretary's right-hand man. He was one of the men responsible for overseeing the recovery of atomic weapons hijacked by SPECTRE. The character appeared in the 1965 James Bond film Thunderball and was portrayed by Reginald Beckwith.
Kenniston is first seen at the emergency meeting of the 00-Branch concerning the theft of two atomic bombs by the criminal organization SPECTRE.
Later, after receiving the organization's demands, the Home Secretary asks Kenniston to call De Beers.