The $10 bill features Alexander Hamilton, the first U.S. Secretary of the Treasury.

Hamilton was never president. He is one of only two non-presidents on current U.S. paper money. The other is Benjamin Franklin on the $100 bill.

Hamilton founded the U.S. financial system, including the first national bank. He helped write The Federalist Papers and founded the Coast Guard, originally known as the Revenue Cutter Service.

In the 1800s, some $10 bills featured images of bison and eagles.

He was killed in a duel by Vice President Aaron Burr in 1804 after a political feud turned deadly.

Hamilton’s face first appeared on the $10 bill in 1929, during the small-size currency era. The modern portrait is based on a painting by John Trumbull.

The modern $10 bill has a security thread that glows orange under UV light. It was one of the first U.S. bills to feature subtle background colors such as peach, orange, and yellow.

The back of the $10 bill features the U.S. Treasury Building, which is located in Washington, D.C., next to the White House.

The Broadway musical Hamilton caused a huge spike in public interest in the $10 bill.

In 2015, there were discussions about replacing Hamilton with a woman on the $10 bill. Public support, along with the popularity of the musical Hamilton, helped keep him on the bill. Instead, redesign plans shifted focus to featuring Harriet Tubman on the $20 bill.