Morison was a founder member of the influential illustration studio Big Orange which was a trailblazer for creative businesses in Shoreditch, London.
In 2003 he left London to live and work in New York . Three years later he returned to the UK and moved to Norfolk – a county he had grown up in. Whilst continuing to work as an illustrator he has also been painting the landscape around his home.
Morison is on the teaching staff of Norwich University of the Arts (NUA) where he is a part-time tutor on the BA(hons) Illustration course.
He has previously lectured at numerous colleges in the UK. In the USA he has been a visiting lecturer at Savannah College of Art and Design, Georgia (SCAD) and run drawing workshops on the architecture program at Rice University, Houston, Texas.