Gregor studied drawing and painting at Edinburgh College of Art under Sir Robin Philipson and James Cumming 1962-66. A post -graduate scholarship with a highly-commended endorsement was followed by a travelling scholarship to Florence and Rome 1966-7.

He lives in Kilcreggan, Argyll and Bute, in a house which overlooks the Clyde estuary with superb views of Arran, Holy Loch, Loch Long with Gareloch just round the corner and extensive open vistas towards Glasgow up river. Most of his subject matter is drawn from these lochs, the surrounding hills and coastal edges. Variations in weather patterns, atmospheric changes and subtle changes of colour, shapes and textures all forming vital compositional elements.