Artist, born in Nuneaton, Warwickshire, who gained a national diploma in design, painting, at Coventry College of Art, 1958–62, then attended Slade School of Fine Art, 1962–4. At Coventry and the Slade a fellow-student was John Bowstead, and together they had a show, A New Kind of Brightness, at the Umbrella Club, Coventry, in 1961. In 1964, Jeffs, Bowstead and two other Slade students, Terry Atkinson and Bernard Jennings, formed the group Fine Artz which collaborated on a work called Action Chair. The group presented a project and sound show called Miss Misty and the Tri-Cool Data at Birmingham Polytechnic in 1966. After Fine Artz, Jeffs and Bowstead continued to work together until 1968–9 in Light-Sound Workshop, a research unit based at Hornsey College of Art.