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Emily was also the niece of US Representative Timothy Pitkin, the granddaughter of the Rev. Timothy Pitkin (Yale 1747), great-granddaughter Governor William Pitkin and the Reverend Thomas Clap, who was the fifth President of Yale College; and a descendant of Governors George Wyllys and John Haynes of Connecticut and Governor Thomas Dudley of the Massachusetts Bay Colony, and Governor William Bradford of the Plymouth Colony.
Haynes was the second son of John Haynes of Copford Hall in Essex and Mary Thornton, daughter of Robert Thornton of Nottingham.
Haynes was likely born at Messing, Essex, England, the eldest son of John Haynes and Mary Michel Haynes.
A USA Today article from 1993 described Dr Haynes' as "a cross between Marcus Welby and John Wayne".