She studied at Bishop Anstey High School.[1] migrated to the United States at the age of 13, and returned to Trinidad and Tobago ten years later. After winning the Miss Trinidad and Tobago Universe title, she went on to be crowned Miss Universe 1977 in Santo Domingo, Dominican Republic and in the process became the first black woman to win the prestigious pageant crown. After winning the title, she was most commonly known as 'Penny' because she was small as a penny.
She was elected Miss Photogenic four days before the final, becoming the first black woman to win these awards in Miss Universe history. On July 16, in the National Theater of Santo Domingo, Commissiong was crowned Miss Universe, attracting international attention as the first black winner in the chronology of Miss Universe.[citation needed]
During her reign, she was an advocate for black rights and world peace. Commissiong was awarded the Trinity Cross, the country's highest award, in 1977. Three postage stamps were also issued in her honour. In 2017, Queen Street located in the capital of Port of Spain, was renamed to Queen Janelle Commissiong Street in tribute of her 1977 Miss Universe win.[citation needed]
Commissiong was named chair of the newly formed Tourism Trinidad Destination Management Company in October 2017. From 2012 to 2015 she had served as vice-chair of its predecessor agency, the Tourism Development Company.[2]
She married Brian Bowen, founder of Bowen Marine, who died in an accident in November 1989. After his death, she married businessman Alwin Chow. [citation needed]