John was the second son of Henry de Grey of Grays Thurrock in Essex. He served as High Sheriff of Buckinghamshire and Bedfordshire in 1238-39 and of High Sheriff of Herefordshire in 1252-53, undertaking military service in Flanders in 1232. He lived at Shirland in Derbyshire, married three times and his son, by his second wife, was Reginald de Grey, 1st Baron Grey de Wilton. He was accordingly an ancestor of many of the noble houses with the surname Grey. He died in March 1266.
Burkes Peerage and Baronetage (1939), s.v. Grey de Ruthyn