William Joseph Kieffer [also known as William J. Kieffer and as as W.J. Kieffer] was born in Coblenz, Germany on 28 March 1888 and was active as an architect in the UK from the 1920s to the 1940s.
During the 1920s Kieffer was in partnership with Herbert Sidney Fleming (1881-1955) as Kieffer & Fleming, and with ? Keesey [possibly Walter Monkton Keesey (1887-1970)].
The memorial hall and library in Caterham, Surrey, designed by Kiffer, Fleming & Keesey is discussed in 'The Builder' 13 June 1924 (after p.944), and a photographs of 'Lordships Close', in Stapleford, Cambridgeshire, the dining hall fireplace at the Manor House in Quendon, Essex, and the garden at 'Southlands' in Kettering, Northamptonshire, designed by Kieffer & Fleming are illustrated in 'The Studio Yearbook of Decorative Art' 1925 (pp.27, 52, 71, 179), and photographs of 'Lordship's Close' in Stapleford, Cambridgeshire, 'Homeways' in Weybridge, Surrey, and a cottage in The Close, Hatfield, Hertfordshire, designed by Kieffer & Fleming are illustrated in 'The Studio Yearbook of Decorative Art' 1926 (pp.28, 44).
During the 1940s Kieffer was in partnership with A.I. Richards. Canterbury Hall, an Anglican hostel for students at the University of London designed by A.I. Richards and W.J. Kieffer is discussed in 'The Builder' 13 November 1942 (pp.415-418). 'Duke's Lodge', a block of flats at Holland Park in Kensington, London, is also discussed in 'The Builder' 29 May 1942 (p.467)
Kieffer's address was given as 139, Bevington Road, Aston Manor, Aston, Warwickshire in 1901; 78 Forthbridge Road SW, Battersea, London in 1911; and Bridge Cottage Abbottsbrook, Stokenchurch, Wycombe, Buckinghamshire in 1939. He died in Sutton Coldfield Warwickshire in July 1944