Gardner Fox continued to create dynamic female heroes during the Silver Age, such as Zatanna in "Hawkman" #4 (Nov. 1964) with Murphy Anderson, the daughter of Zatara, a character Gardner Fox invented during the Golden Age.

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Gardner Fox continued to create dynamic female heroes during the Silver Age, such as Zatanna in "Hawkman" #4 (Nov. 1964) with Murphy Anderson, the daughter of Zatara, a character Gardner Fox invented during the Golden Age.
Gardner Fox would create the modern version of Batgirl/Barbara Gordon in "Detective Comics" #359 (Jan. 1967) with Carmine Infantino on request of the "Batman" TV producers, who wanted to introduce a female superhero in the series to boost ratings. Of note, Barbara Gordon is a librarian, which is a nod to Fox's sister, Kay, who was one in real life.
While the creation of Barry Allen's The Flash was successful and launched the Silver Age, it lead to a lot of fans asking what happened to the original Jay Garrick. This lead to Julie Schwartz to ask Gardner Fox to come up with a story to fix, leading to the classic "The Flash" #123 (Sept. 1961), that introduced the multi-verse to explain how there can be two different Flash's. It would be a foundational element of later DC stories.
Gardner Fox would play his part during the Silver Age with the revival of the superhero, this time the Justice League of America in "Brave and the Bold" #28 (Mar. 1960), featuring Superman, Batman & Wonder Woman with rotating members like Aquaman & Green Arrow. It would be so successful it reportedly inspired Marvel to come up with the Fantastic Four.
"Our imaginations peopled the caverns with rare, dread beings..."
“The Quaking Horror”, Creepy #42, November 1971, written by Gardner F. Fox, art by Rafael Auraleón
Gardner Fox would introduce the first superhero team in "All-Star Comics" #3 (Nov. 1940) with the Justice Society of America, featuring many of his co-creations such as the Flash, Hawkman, Dr. Fate and the Sandman. It would set the standard for all to follow.
Gardner Fox made his first major contribution to the DC Comics in "Flash Comics" #1 (Jan. 1940), where he co-created both the Flash and Hawkman, two of DC's most iconic heroes to this day. It was only the beginning.
Oh for Pete's sake, take a chill pill, Bruce!
From Detective Comics (vol. 1) #29 (July, 1939). Written by Gardner Fox, art by Bob Kane.