Short answers, pulled from the story.
Jacob Kurtzberg arrived at 147 Essex Street on the Lower East Side of Manhattan on the 28th of August 1917. His parents Rose and Benjamin were Austrian-Jewish immigrants who struggled to make ends meet as garment factory workers.
Kirby was drafted into the U.S. Army on the 7th of June 1943 and landed on Omaha Beach in Normandy on the 23rd of August 1944 months after D-Day. A lieutenant made him a scout who advanced into towns drawing reconnaissance maps and pictures before he suffered severe frostbite and recovered in London.
For almost a decade Kirby provided Marvel's house style creating many characters including Ant-Man the Avengers Black Panther the Hulk Iron Man Thor and the X-Men. He designed their visual motifs and often provided new-to-Marvel artists breakdown layouts over which they would pencil.
In late 1970 Kirby signed a three-year contract with DC Comics under editorial director Carmine Infantino and produced interlinked titles under the blanket sobriquet The Fourth World including New Gods Mister Miracle and The Forever People. Infantino and company were not receptive to Kirby's proposals for square-bound trade paperback formats.
Kirby died of heart failure on the 6th of February 1994 aged seventy-six in Thousand Oaks California. He was buried at Valley Oaks Memorial Park in Westlake Village.