Final answer:
Thomas Jefferson was the writer of the Declaration of Independence who later gave the oath of office to George Washington.
Step-by-step explanation:
The writer of the Declaration of Independence who was a lawyer and eventually gave the oath of office to the nation's first president, George Washington, was Thomas Jefferson. Jefferson was one of the founding fathers of the United States and played a crucial role in the drafting and adoption of the Declaration of Independence.
Learn more about Thomas Jefferson's role in writing the Declaration of Independence and administering the oath to George Washington