Matthew Edward Kimber (born August 6, 1977), better known by his stage name Josh Martinez, is a Canadian rapper, record producer, and record label executive. Josh had competed on five seasons of the MTV staple reality series.

Known for his penchant for conflict and emotional outbursts, he vowed that he would get in the best shape of his life to make a final for the first time in his Challenge career, and hopefully take home his second reality TV win.

Josh Martinez siblings: Meet Maytee Martinez

He was born and raised in West New York, New Jersey; he later moved to Miami, Florida in his early teens. His sister is fellow reality star Maytee Martinez.

As a runway model, Martinez has worked for designers such as Dior, Guess, Valentino, Carolina Herrera, Roberto Cavalli, and others. She has also modeled at fashion weeks, including the Mercedes Benz Fashion Week, New York Fashion Week, and Miami International Fashion Week.

Martinez appeared in a Colombian television series. El Cartel de Los Sapos, the BET movie, CO2, and several short films. She also appeared on the popular Univision program, Sabado Gigante.