[Whatever Works]

Jefferson. He wrote most of the Constitution and I’d have him fix a few things. Alternatively, Andrew Johnson who was President when the 14th amendment came into being. It needs much stronger wording and clarification.

[Publius]

Madison wrote most of the Constitution. Jefferson was not present at the Constitutional Convention.

[Political Junkie Too]

Jefferson wrote none of the Constitution. He was the ambassador to France at the time.

Madison was the Father of the Constitution.

-PJ

[Rockingham]

Jefferson was in France as US ambassador during the entire constitutional convention. For insight into the Constitution, you would want Madison, who wrote the draft, defended its provisions, kept a diligent record of the debates, wrote much of the Federalist Papers, and organized the campaign for adoption. He then wrote the bill of rights in the first Congress.

[Reily]

Jefferson was not at the Constitutional Convention he was in France at the time. You’re likely thinking of Madison.