John Philip Holland was born on February 29, 1840.

John Philip Holland was born on February 29, 1840.

John Philip Holland died on August 12, 1914 at the age of 74.

John Philip Holland was born on February 29, 1840 and died on August 12, 1914. John Philip Holland would have been 74 years old at the time of death or 175 years old today.

He invented the submarine, something like an underwater boat, if you don't know what it is.

John Philip Holland developed the first submarine to be formally commissioned by the U.S. Navy, and the first Royal Navy submarine, the Holland.