Kennedy was born at Culzean Castle, Ayrshire,[1] the third son of Archibald Kennedy, 3rd Marquess of Ailsa and his first wife, Hon.

[2] Kennedy gained the rank of lieutenant in the Royal Naval Volunteer Reserve and the rank of captain in the Royal Air Force.

[2] Kennedy succeeded to the titles of 17th Earl of Cassilis, 19th Lord Kennedy, 6th Marquess of Ailsa & 6th Baron Ailsa on 1 June 1956.

[2] He married Gertrude Millicent Cooper (daughter of Gervas Weir Cooper, of Wordwell Hall, Bury St Edmunds, Suffolk) on 28 January 1922 and they had one child: Lord Ailsa died on 31 May 1957 and was succeeded in his titles by his only son, Archibald.

This biography of a marquess in the peerage of the United Kingdom is a stub.