Background
She was born in Trindad, but her father was exiled to Harlem in 1917 due to his opposition to the colonial government, and in 1919 the rest of his family joined him. Her father eventually became a doctor at the age of 40. After taking a few years off when her son was born in 1947, she started her practice again on the ground floor of her home, which was also where her father had his practice.
Education
In 1937 Muriel graduated from Howard University Medical School, where she was the only woman in her class.
Career
She was among the first generation of black doctors given staff privileges at Harlem Hospital in the 1950s. Working with the Coalition of 100 Black Women, she also developed a mentorship program to guide young African American women into careers in science and medicine. She was also a president of the Society of Black Women Physicians.
Her awards include the Howard University College of Medicine Outstanding Alumni Award, given in 1992, and the 1999 Frederick Douglass Award, bestowed by Douglass"s great-great granddaughter, which was the highest honor of the New York Urban League.
In 2007 she was awarded a Barnard College Medal of Distinction. Petioni"s obituary was included in The Socialite who Killed a Nazi with Her Bare Hands: And 144 Other Fascinating People who Died this Year, a collection of New York Times obituaries published in 2012.