John Hancock: First MA Governor, Continental Congress President, Declaration Signer

Yes. John Hancock (1737–1793) uniquely held all three distinctions:

1. President of the Second Continental Congress (1775–1777) — presided over adoption of Declaration of Independence.
2. First Signer of the Declaration — famously large signature ("John Hancock" = synonym for signature).
3. First Governor of the Commonwealth of Massachusetts (1780–1785, 1787–1793) — under the 1780 state constitution (world's oldest functioning written constitution).

Additional Roles

• President of Massachusetts Provincial Congress (1774).
• Major financier of the Revolution.
• President of the 1788 MA ratifying convention (narrowly approved US Constitution).

Hancock's wealth, popularity, and moderate politics made him a unifying figure in the transition from colony to state to nation.