Cooke was educated at
Shrewsbury School in 1583. He became Clerk of Liveries on the death of his father in 1589, though he was only 17. He was admitted for the study of law at
Gray's Inn in 1592. In 1593 he went abroad, with a two-years’ licence to travel after his mother's unsuccessful attempt to
arrange a marriage for him while he was a minor. By 1596 he was a
Justice of the Peace for Hertfordshire. Cooke's father's eldest sister,
Mildred Cooke, had married
Lord Burghley, and Cooke received patronage from both Burghley and
Sir Robert Cecil, his own first cousin. Cecil's influence may have secured him his seats in Parliament. In 1597 he was elected a
Member of Parliament for
Helston. By January 1599 he was Purveyor to the Stable and had sufficient property to offer himself, with six men and horses, for service to Queen Elizabeth I. In 1601 he was elected an MP for
Westminster. He was knighted at
Theobalds House on 7 May 1603. In 1604 he was elected an MP for
Wigan. He enhanced his estates by purchasing further land in and around
Gloucester, and also owned Ribbesford Manor and other property in Worcestershire. In the reign of King
James I he was keeper of the lodge and herbage of Hartwell Park, Northamptonshire. By 1605 he was a JP for Gloucestershire. He was steward of the manor of
Bury St. Edmunds by 1614. In 1614 he was elected as an MP for
Gloucestershire. ==Marriages and children==