John Marshall was the son of Thomas Marshall and Janet Fidler. He was born in 1646 in New Haven, Connecticut. He died after May 12, 1712 in Greenwich, Fairfield County, Connecticut.
The first record of him in Greenwich was on April 15, 1669 when he was granted a parcel of meadow land at Cos Cob Neck.
At the town meeting of February 6, 1670, the committee reported that the town had obtained the title to the Mioschassiky lands from the Indians. The land was laid out "to ye number of thirty lots, four acres to the homelot." These purchasers would be later called the "27 Proprietors of 1672." John Marshall was listed. This area known as "Greenwich Old Towne", now Sound Beach, was first settled on the east side of the Myanos River. Horseneck, roughly what is now the modern city of Greenwich, Connecticut, was not settled until later.
On December 6, 1689 he was one of the overseers of the will of Thomas Lyon -

"I have made choice of Thomas Brown of Rye and John Marshall Senior of Greenwich to be my Overseers to mee"

On December 14, 1693, he purchased land from John Hobby.
In the tax year of 1694 to 1695, he and his son are listed as having 165 pounds, and 10 shillings.
He married three times: to a daughter of John Rockwell, Elizabeth Lyon and Sarah Webb. The marriage to Sarah Webb took place on May 16, 1699.

John Marshall had the following children:

John ( - bef Dec. 13, 1726) m. Abigail Banks
Joseph ( - 1748) m. Mary
David ( - )
Daniel (1679 - aft 27 Apr 1725) m1. Abigail Butler, m2. _____
Martha ( - ) m. Thomas Merritt
Samuel ( - Apr 1713) m. Mary Whelpley
Hannah ( - )

In 1708, John Marshall deeded land to his son David. On January 2, 1710, deeded land to his son Samuel. In 1712 he deeded land to his sons John and Joseph. Then on May 2, 1712, his son Joseph purchased additional land from his father.