From Rob Roy, p. 3: "He was sent circa 1631 to New Hampshire, by Capt. John Mason. He was living on 25 May 1640 in Strawberry Bank, now Hampton, New Hampshire. He became a freeman on 18 May 1642 in Newbury, Massachusetts [n.b. William Berry is on the list of first settlers of Newbury]. He was a proprietor on 7 December 1642 in Newbury, Massachusetts. He was granted land on 31 January 1648 in Sandy Beach, now Rye, New Hampshire. He served on a grand jury on 8 October 1650. He was granted land on 13 January 1652 in Sandy Beach, now Rye, New Hampshire, of another 40 acres." Roy's text documents this with many standard references.
Noyes et al (p. 90) state that William was at Strawberry Bank before 1636 and that his widow Jane deposed in 1686 that they were in the area prior to the arrival of Francis Williams. William was also a constable for the lower Strawberry Bank in 1650.