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In page Ellen Langer:

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Langer is well known for her contributions to the study of mindfulness and of mindless behaviour, with these contributions having provided the basis for many studies focused on individual differences in unconscious behavior and decision making processes in humans.[1] In 1989, she published Mindfulness, her first book, and some have referred to her as the "mother of mindfulness".[2][3] In an interview with Krista Tippett on the National Public Radio program "On Being," broadcast on Sept. 13, 2015, Langer defined mindfulness as "the simple act of noticing new things."[4] The Langer Mindfulness Scale is still used in modern research.