Peter Williams (1937–2016) was an internationally renowned Bach scholar and performer. He was Professor of Performance Practice and the first Director of the Russell Collection of Harpsichords at the University of Edinburgh, Arts and Sciences Distinguished Professor at Duke University, North Carolina, and John Bird Professor at the University of Wales, Cardiff. He wrote numerous books on the organ, organ history and organ repertoire. The first edition of The Organ Music of J. S. Bach was published in 1980 (Volumes 1 and 2) and 1984 (Volume 3).