Marshall continued figure drawing at Sheridan College and the Toronto School of Art. After which, he pursued private studies with wildlife master Geordie Millar and Disney drawing trainer Glen Vilppu.
In 2013 Marshall studied figure drawing, figure painting and cartooning at the Art Students League of New York with Harlequin book cover illustrator Max Ginsberg and Jack Faragasso. His personal studies include the history of comics and newspaper cartoonists from the early 20th century and the 1950’s Famous Artist Course.
In 2015 Marshall started Drawing House – a studio and art supply store in Barrie Ontario. Aside from working in his studio, he teaches cartooning, life drawing and anatomy at the Maclaren Art Centre and throughout Simcoe County.