William J Renwick completed B. Mus, and M. Mus. degrees at the University of British Columbia, following which he took the M. Phil. and Ph.D. degrees in Music Theory at the City University of New York, where he specialized in Schenkerian studies under Carl Schachter, Joel Lester, and Charles Burkhart. He is Professor Emeritus of Music Theory in the School of the Arts, McMaster University. His research interests encompass studies in tonal counterpoint and analysis and Gregorian chant as well as computer applications in music research. His publications include Analyzing Fugue: A Schenkerian Approach (Pendragon, 1995), and The Langloz Manuscript: Improvising Fugue from Thoroughbass (Oxford, 2001), Sarum Compline (Gregorian Institute of Canada, 2018, 3 Vols.):as well as articles in Journal of Music Theory, Music Theory Spectrum, Music Analysis, Bach Perspectives, Music Theory Online, Theoria, Computers in Music Research, Canadian University Music Review, Journal of Music Theory Pedagogy, and other journals. He is currently working on a complete scholarly and performing edition of the The Sarum Rite. In 2002 he was a Fellow of the Mannes Institute for Advanced Studies in Music Theory. He is a founding member of the Gregorian Institute of Canada, and of McMaster Institute of Music and the Mind, and serves on the Editorial Boards of Theoria and Music Theory Online.

William Renwick is also an organist, composer, and choral director. As an organist he studied with Frederick Geoghegan, Frederick Carter, and Gerre Hancock.  He holds the Associate degree of the American Guild of Organists and the Fellow of the Royal Canadian College of Organists. He has performed concerts and recitals throughout the region.  In 1999 he served as co-chair of The Canadian Organ Festival in Hamilton. He is Music Director at Saint Mary the Virgin Church in Hamilton Ontario, Organist at Holy Rosary Church in Burlington, Organist at Grace Church in Hamilton, and Director of the Hamilton Schola Cantorum.

William Renwick also plays trumpet and flugelhorn, having studied with Sid Arnold, Ray Kirkham, and Martin Berinbaum.  He is a regular in the Hamilton Concert Band, the Jimmy Stahl Big Band, and the Jimmy Murando Swing Band.  He has performed with conductors Boris Brott, Boyd Neel and Simon Streatfield, and artists such as Tommy Ambrose, Dave Boyer, Bobby Herriot, John Lombard, Andy Gravitas, John Sherwood, Dave Stahl and Barbara Butler.