Actress. She is known as the third wife of Pulitzer Prize and Nobel Prize recipient playwright Eugene O'Neil. Born to Danish immigrant and fruit farmer in Northern California, Christian Nielsen Tharsing, and California native Nellie Gotchett, as Hazel Nielsen Tharsing in San Francisco, California, she was raised by her aunt, having been abandoned by her father at age four. Known for her beauty and acting ability, she won the title of "Miss California," a beauty pageant. She traveled to London afterwards, studying acting with Sir Herbert B. Tree, and, upon returning to the United States, changed her name to the more professional Carlotta Monterey. She pursued a career in acting, appearing on the stage as well as in several silent films. After two disastrous marriages, she married cartoonist Ralph Barton, who was known for his caricatures of famous celebrities. This marriage too ended in divorce and in 1926 she again became romantically involved, this time to the famed Eugene O'Neil, whom she had met while working on his play "The Hairy Ape." The couple married in 1929, less than a month after Eugene's divorce from his second wife. Moving to France, they purchased and lived in the Chateau du Plessis in Indre-et-Loire; later moving back to America in 1930 and living in the famed 'Casa Genotta' in Sea Island, Georgia. She devoted herself to her husband, organizing his life to allow him time to write. With the undue stress of her husband's deteriorating health, both mentally and physically, she became addicted to potassium bromide, which led to numerous separations, though the couple never divorced. Shortly after his death in 1953, she arranged for his autobiographical play "Long Day's Journey Into Night" to be published, despite his written instructions that that it not be made public until 25 years after his passing. Appearing onstage in 1957, it won the Pulitzer Prize. In 1964, six years before her death, she established her will, which would leave everything, including all royalties from her late husband's play, to Yale University, which had also benefited from her husband. Through massive copyright issues, she had lost control of many of her husband's successful plays, including "A Moon for The Misbegotten," thus decreasing the size of her estate.