Final answer:
John Hancock, a wealthy Bostonian, served in the Continental Congress for Massachusetts and was later elected as its governor.
Step-by-step explanation:
The individual who served in the Continental Congress for Massachusetts and later became its governor was John Hancock. John Hancock was a wealthy Bostonian who was elected as the president of the second Continental Congress. Subsequent to his role in the Congress, Hancock's political career furthered as he became the governor of Massachusetts. His prominence in the early United States includes not only his leadership position within the Congress but also his notable role in the events leading up to the American Revolution, such as his indirect involvement with the Sons of Liberty and the seizure of his ship, the Liberty, by customs officials in 1768, which led to significant unrest in Boston.