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Baptised Dudley Long at Saxmundham, Suffolk, he was the younger of two sons of Charles Long (1705–1778), landowner, of Hurts Hall, Suffolk, and his wife, Mary, daughter and coheir of Dudley North of Little Glemham, Suffolk, and granddaughter of Sir Dudley North.
In 1641 he was a member of the Lords committee on Religion, and served on the committee to consider Laud's attainder in 1644, finally voting for the ordinance in January 1645.
Sir William Spring, 2nd Baronet (1642–1684), married first Mary, daughter of Dudley North, 4th Baron North (no issue) and married second Sarah, daughter of Sir Robert Cordell, 1st Baronet of Melford Hall, Suffolk, who whom he had three children.