Katherine Green (née Court) is Hank Green's wife. She was born on the 17th of May 1980.

Katherine does appear on camera occasionally. She is involved in hankgames, where she plays Super Mario Bros with Hank, as well as her own gameplay of The Legend of Zelda: Skyward Sword. She also contributes to other channels, most notably multiple credits as 'Script Supervisor' on Crash Course Chemistry. She also has her own channel, elfkwest, which features 28 various video blogs and other clips.

Despite one of John Green's novels being called An Abundance of Katherines, this naming is purely coincidental.

Katherine's Channel: Elfkwest

Katherine's Twitter: realkgreen

Katherine's Instagram: realkgreen
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Katherine Green (née Court) é a esposa de Hank Green. Diferentemente de Sarah Green, Katherine aparece em câmera algumas vezes. Ela está envolvida com Hankgames, onde ela joga Super Mario Bros com Hank, assim como em seu próprio gameplay de A Lenda de Zelda: Skyward Sword. Ela também contribui para outros canais, mais comumente creditada como 'Supervisora de Script' em Crash Course Chemistry (Química).

Apesar de um dos livros de John Green se chamar "O Teorema Katherine", esse título é uma mera coincidência.