Artist using gouache, and oil with wax medium, born and lived in Glasgow, where he attended non-diploma classes in drawing and painting. Hugh Adam Crawford, his teacher, commented: “Senior, you are a painter’s painter.” Senior’s output of landscapes and still lifes was small; he claimed to be “not only unambitious, but very lazy, a Laodicean, as Thomas Hardy put it.” Painting influences were many, and Delacroix’s and Gauguin’s Journals, Sickert’s A Free House, Whistler’s Ten o’clock and Pissarro’s Letters to Lucien were “goldmines”. After returning from Paris, 1947–8, Senior “decided not to starve ever again, so I worked in bookshops, was a farmhand near Mull, became a scene-hand with BBC Television, then went to the Groves of Academe in a television department where I did the graphics and studio sets.