[1] Much of her scholarship concerns the life and work of Guillaume de Machaut.
Leach is a professor of music at St Hugh's College, Oxford (a constituent college of the University of Oxford), where she lectures on the music of Guillaume de Machaut and the trouvères.
[1] She has written extensively on Machaut as well as birdsong and nature in the medieval music.
[3] Leach's major publications include Sung Birds: Music, Nature, and Poetry in the Later Middle Ages (2007) and Guillaume de Machaut: Secretary, Poet, Musician (2011),[2] which received the Phyllis Goodhart Gordan Prize from The Renaissance Society of America.
[4] Music historian Alice V. Clark remarked that Leach's Guillaume de Machaut: Secretary, Poet, Musician will become will "likely become the standard monograph study of Machaut’s life and works".