Trained at Harrow School of Art from 1958-1963, he established his first studio in 1965 and in 1976 moved to Monmouthshire in Wales. Keeler is regarded as a foremost exponent of salt-glaze work. He had two distinct styles: salt-glazed stoneware and whieldon-glazed earthenware. His designs draw on eighteenth century Staffordshire moulded pottery, the forms of Roman blown glass and the old-fashioned metal milk churns and oil cans.