After some menial jobs, he met Alfred Dawson, a pioneer of photomechanical printing (photographic etching) for the printing trade, and joined his business. In 1886, he formed a partnership with Walter Boutall, and later traded under his own name, specializing in high-quality reproductive work in both relief and photogravure. In 1883, he met his Hammersmith neighbour W. Morris, and advised him on setting up the Kelmscott Press, especially influencing the Press's closely spaced setting style. Morris offered him a partnership, which he modestly refused. His advisory role for Cobden-Sanderson’s Doves Press notoriously ended in mutual acrimony. Walker also advised Harry, Graf Kessler on a series of German classics, suggesting that E. Gill engrave the title-pages. He worked with Rogers, and was a powerful influence behind many presses.
From The Oxford Companion to the Book in Oxford Reference.