The eldest son of Baldwin Hamey the Elder, he was born in London 24 April 1600 of Flemish and Dutch parents.
He was admitted a Fellow of the College of Physicians of London on 10 January 1633, was eight times censor, from 1640 to 1654, was registrar in 1646 and 1650 to 1654, and treasurer 1664–6.
He was buried in the parish church, beneath a black marble slab bearing his name, the date of his death, and the sentence: "When the breath goeth out of a man he returneth unto his earth".
He supported the Oxford education of John Sigismund Clewer, son of Philipp Clüver.
His gift in 1672 to the College of an estate near Great Ongar in Essex indirectly supported the physicians of St. Bartholomew's Hospital.
Several of his manuscripts were left to the College of Physicians:[1] Adam Littleton edited in 1693 Hamey's work on the Hippocratic oath, Dissertatio epistolaris de juramento medicorum qui ὅρκος Ἱππoκράτους dicitur.