The London glaziers firm James Powell and Sons of Whitefriars, commonly called Whitefriars Glass, produced windows for Anglican churches on both sides of the Atlantic during the interwar period. James Humphries Hogan, who was chief designer at the time, devised windows for the cathedrals of Hereford, Rochester, Exeter, Carlisle and Winchester.
In the 1920s Hogan traveled extensively in the United States, setting up a satellite office in New York. Among other commissions, he designed windows for Saint Thomas Episcopal Church on Fifth Avenue, arguably the finest stained glass in the city. These windows recently underwent complete restoration from the lead cames to the nine million individual pieces of glass.
An example below features the Powell and Sons “white friar” maker’s mark.