Elisabeth Kübler-Ross was a Swiss-American psychiatrist best known for her work on the psychology of death and dying. She introduced the Kübler-Ross model, which outlines five stages of grief: denial, anger, bargaining, depression, and acceptance. Her groundbreaking book, "On Death and Dying," published in 1969, brought attention to the emotional experiences of terminally ill patients. Kübler-Ross's work significantly influenced the fields of psychology and palliative care, emphasizing the importance of understanding patients' emotional needs. She advocated for compassionate care and open discussions about death, helping to change societal attitudes toward dying and grief.