At the time 17-year-old Nessman was still attending high school at Georges P Vanier Secondary [citation needed] and did not pursue his modelling career until graduating.

In addition, he has featured in ad campaigns for Versace, D&G, Givenchy, Calvin Klein, Ralph Lauren, Lanvin, Yves Saint Laurent, Barneys, Gap and John Galliano.

He has walked in shows for Salvatore Ferragamo, Roberto Cavalli, Tommy Hilfiger, Emporio Armani, Viktor & Rolf, Lacoste, DSquared², Narciso Rodriguez and Michael Kors and appeared in Vogue, Details, Numéro, V Man and L'Officiel Hommes.

[4] In 2012 Nessman became the face of the Giorgio Armani fragrance Acqua di Gio Essenza in an advertising campaign shot and directed by Bruce Weber.

[5] From late 2010 to 2014 Nessman starred in multiple print and film campaign advertisements for American fashion designer Michael Kors with Karmen Pedaru.