Thomas Jefferson rightly receives the lionshare of credit for writing the Declaration of Independence, though he wasn't the only founder who had a hand in its creation.
Following the introduction and debate of Richard Henry Lee's resolution to dissolve ties with Great Britain, the Second Continental Congress appointed a Committee of Five -- John Adams, Roger Sherman, Benjamin Franklin, Robert R. Livingston, and Thomas Jefferson -- to write the Declaration during the Congressional recess.
Later, Jefferson wrote of the Committee:
"unanimously pressed on myself alone to undertake the draught [sic]. I consented; I drew it; but before I reported it to the committee I communicated it separately to Dr. Franklin and Mr. Adams requesting their corrections. . . I then wrote a fair copy, reported it to the committee, and from them, unaltered to the Congress."