[4] Religious education programs under the auspices of the Confraternity of Christian Doctrine were organized in every part of the diocese, and he founded five regional high schools after age 80 alone.

[4] In 1937, Gannon became head of the committee of American bishops that founded Montezuma Seminary in New Mexico to train Mexicans for the ministry.

[1] He also served as chair of the Commission for the Canonization of the Martyrs of the United States, and was the personal representative of the American hierarchy at the Eucharistic Congress in Brazil and at the fiftieth anniversary celebration of the pontifical coronation of the image of Our Lady of Guadalupe.

[4] In 1938, Gannon went to Spain to conduct his own investigation of reports of atrocities and persecution of the Catholic Church by the Loyalist Government.

Pope Paul VI accepted Gannon's resignation as bishop of Erie on December 9, 1966; he was appointed Titular Archbishop of Tacarata on the same date.

Its Archbishop John Mark Gannon Award is presented to students who have attained the highest grade point average upon graduation.