In 1989, Welsby moved to Canada to take the position of Professor of Film and Digital Media at the School for the Contemporary Arts at Simon Fraser University in Vancouver.
He retired from his full-time Academic duties in 2012 and now holds the position of [Professor Emeritus] at Simon Fraser University’s Faculty of Arts Science and Communication.
In Millennium Film Journal (1987), Peter Wollen wrote: "Welsby's work makes it possible to envisage a different kind of relationship between science and art, in which observation is separated from surveillance, and technology from domination.
"[4] He spent twenty years exploring ways to make films and gallery installations in which natural forces such as wind, tide, cloud cover and the rotation of the planet share creative control.
In Chicago Film Reader (2001), Fred Camper observed: "In the 20-minute Seven Days (1974) Welsby finds his mature voice, offering a tour de force unlike anything cinema had yet seen.
"[6] In 1993, after he had moved to Vancouver, British Columbia, Welsby abandoned film and began making digital video installations such as At Sea, Waterfall and Lost Lake.
[7] Ian Christie (Professor of Film and Media History, Birkbeck, University of London), in Sight and Sound Magazine (2007) wrote: "Two recent installations by veteran English landscape filmmaker, Welsby (now based in Canada), showed how digital images can realise the ambitions once vested in 16mm to near-sublime perfection.