Creator of semi-abstract works who left school at 15 and worked in the fishing and building industries, starting to paint in 1975. Did a foundation course at Norwich School of Art, 1982, gaining an honours degree in fine art from Winchester School of Art, 1983–6. Settled at Ness in the Outer Hebrides where the singular landscape of Lewis and the image of the Butt of Lewis lighthouse featured strongly in his pictures. Mixing his own colours from raw pigment and blending mediums such as wax, resin, oil and tempera he produced works of great vigour. Exhibitions included Flying Colours Gallery, Edinburgh, 1993, and Coombs Contemporary, 1994. Greenall was included in New Artists at Piers Feetham Gallery in 2003, where his partner Ruth O’Dell also showed.