probably the last and the best of English boy actors playing female roles.

His last female role was in Beaumont and Fletcher's Maid 's Tragedy with Killigrew's Company (1661). Earlier in that year the English diarist Samuel Pepys reports—having seen Kynaston play several parts in Ben Jonson's comedy The Silent Woman, one as a woman gallant in fine clothes—“And in them was clearly the prettiest woman in the whole house; and lastly, as a man; and then likewise did appear the handsomest man in the house.”

Active by 1660, by 1665 he was one of the leading actors of male roles in the company at Covent Garden Theatre, London. He joined Thomas Betterton at Lincoln's Inn Fields in London in 1695, but his memory began to fail and he retired in 1699.