John Boor was dean of the royal household chapel. St. Stephen's served that function throughout the reigns of Richard II.
Elizabeth C. Biggs, St Stephen's College, Westminster: A Royal Chapel and English Kingship, 1348-1548 (Woodbridge, UK: Boydell and Brewer, 2020).
St. Stephen's Chapel, Westminster: Visual and Political Culture, 1292-1941, virtualststephens.org.uk
"Chapel goods," Richard II's Treasure
"Kings at St Stephen's," UK Parliament Living Heritage
Margaret K. Smith