Stevel Marc is the first of two children of Jasmine Williams and Carlton McDonald. He grew up in Portland, Jamaica, where he attended Titchfield High School. His modeling career began when he was professionally discovered by Dwight Peters of the Saint International modeling agency, shortly before he was awarded the title of Mr. Titchfield 2000. This opened up many opportunities with international modeling contracts that sent him to London, New York, Asia, South Africa, and parts of Europe.

He used South Africa as his base, where he is signed with the internationally recognized Ice Model Management, as well as with Artist Connection in the theatrical and commercial fields. It was here that he began to shape and hone his skills through various television and film commercials, including Revlon (with Halle Berry and Eva Mendes), BlackBerry, Coca Cola, KFC, Nescafé, Momentum, Standard Bank, Nashua Mobile, the South African Broadcasting Corporation (SABC), and DSTV. Stevel Marc also works as a voice artist and has already lent his voice to Samsung Mobile, Budweiser, Malibu Caribbean Rum, Toyota, Highveld Stereo, Pigg's Peak Casino, Foundry Premium Cider, Spar, Pick 'n Pay, Standard Bank, Student radio, Exclusive Books, and the South African Tourism Board.

He has been a host for Master Card, Heineken, Fashion Television International (FTV), De Beers, Standard Bank, MTN Go Rig (FIFA Confederations Cup), the FIFA World Cup (Fan Fest and 22 World Cup matches), Sony (World Cup winners' trophy tour), Calvin Klein, BlackBerry, Sansui Summer Cup, SAICA (South African Institute of Chartered Accountants), Cricket SA.

He began auditioning for film roles at around twenty years old in South Africa, honing his craft at the Johannesburg Civic Theatre. In 2008 he enrolled at the New York Film Academy (NYFA) and TVI Actors Studio in Los Angeles, California, to study, and successfully completed his training in film.