J. Alexander, known also as Miss J, is an American model, television personality, and runway coach known for his work as a runway coach and judge on America's Next Top Model. He travels extensively for the fashion and modeling industries. Alexander currently lives in Paris.

Alexander Jenkins was born in South Bronx to Julius and Mary Jenkins and cites his mother as the first person to introduce him to fashion. He was born in 1958.

As a teenager he turned to modeling when he met the president of Elite Model Management, Monique Pillard, while dressed in drag. Pillard was so impressed with his look that she signed him to her agency, and he walked for designer Jean Paul Gaultier in New York City. He is openly gay.

Alexander and Tyra Banks have been friends since she was sixteen years old. Alexander and Banks met backstage at a runway show, and he began to give her walking lessons. Banks coined Alexander's title Queen of the Catwalk.