In 1963, Weatherfords members Glen, Bobby Clark, and Danny Koker departed to work for evangelist Rex Humbard at the Cathedral of Tomorrow in Akron, Ohio.

Over the next 35 years, the Cathedrals won numerous Singing News Fan Awards and had several number one hits on the Southern Gospel Charts including Step into The Water, Boundless Love, and He Made a Change.

During the 1990s, the Cathedrals were regulars on the "Gaither Homecoming" videos and were generally recognized as the top quartet in Southern Gospel music.

Glen sat as a member of the board of directors of the National Quartet Convention and the Southern Gospel Museum and Hall of Fame for many years, being enshrined in the SGMA Hall of Fame at Dollywood in Pigeon Forge, Tennessee itself in 1998.

[4] Glen died due to complications from cancer on October 15, 1999, aged 72 during the Cathedral's farewell tour, just five days before his 73rd birthday.