Susanne Katherina Langer (/ˈlæŋər/; née Knauth; December 20, 1895 – July 17, 1985) was an American philosopher, writer, and educator known for her theories on the influences of art on the mind. She was one of the earliest American women to achieve an academic career in philosophy and the first woman to be professionally recognized as an American philosopher. Langer is best remembered for her 1942 book Philosophy in a New Key which was followed by a sequel Feeling and Form: A Theory of Art in 1953. In 1960, Langer was elected a Fellow of the American Academy of Arts and Sciences.