Mary Loos a stroke. Mary Loos Mary Loos (May 6, 1910 – October 11, 2004) was an American actress, screenwriter and novelist. She was occasionally credited under her full name, Mary Anita Loos. Born in San Diego, she was the daughter of Dr. Clifford Loos, co-founder of the Ross-Loos Medical Clinic and the Ross-Loos Medical Group, the first Health maintenance organization (HMO) in the United States. She was the niece of screenwriter Anita Loos. She was both co-creator and one of the writers for "Yancy Derringer" (1958-1959), an American Western TV series. Mary Loos died in Monterey, California, aged 94, due to
Anita Loos Mizner. When they returned to New York in the spring of 1930, Emerson expressed his unhappiness at her inattention, and the guilt-ridden Loos would spend much more time alone. Emerson had also unwisely invested "their" money, which was lost in the stock market crash, and suggested she return to work. Loos was not unhappy with this, and within a few months had produced a stage adaptation of "But Gentlemen Marry Brunettes" and a comedy "Cherries are Ripe". With their income reduced, the couple moved to a residential hotel and did less traveling in 1931. Not long after, Loos came upon