Stewart was born in Newcastle upon Tyne in 1944. He attended Newcastle College of Art and Design where he studied Photolithography. He worked in the UK and South Africa as a Lithographic Planner before moving to St Ives in 1986.

After a further spell in the printing trade, Steward decided on a career change and, inspired by St Ives' beautiful harbour and the pretty seaside villages of West Cornwall, began painting professionally. His paintings are now sold very successfully through several galleries, both in Cornwall and Northumberland. He also undertakes private commissions for his work.

Steward enjoys fishing for mackerel around St Ives, and his work reflects his affinity with boats and the sea.

Stewart is married with a teenage son.