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This study analyzes the author’s expression on his mental illness in the novel Turtles All The Way Down (2017) written by John Green. This research uses a descriptive qualitative method. With the expressive theory, by Abrams, the researcher uses it to analyze the expressions of the author that exist in the novel and correlated with his biography. The data were taken from the novel, video interview, and personal vlog of the author. The data analysis techniques are reviewed, described, and then draw conclusions. The results of this study show that there are author's expressions in the novel, which are expressed in the title and some parts in the stories of his novel. The title reflected his experience in his collage which has given him a way to face his mental illness in real life. Some parts of the story in the novel also resemble his real life, especially his mental illness. The expressions obtained in the stories are comforted in terms of mental illness, namely Obsessive Compulsive Disorder (OCD), the fear of own thoughts, and anxiety.

Author; Biography; Expressive; John Green; Mental illness