[11][12] In 1991, Harmon presented the paper "The Case against Conditionalism: A Response to Edward William Fudge", defending a traditional Christian view of hell, at the Fourth Edinburgh Conference on Christian Dogmatics in 1991, in disagreement with Edward Fudge's book The Fire That Consumes.

[13][14][15][16] Harmon operates the blog TitusOneNine, which is frequented by those who follow and comment upon Anglican and Episcopal affairs.

[17][18][19] Harmon has remarked upon changes to the 1979 Book of Common Prayer, the ordination of women, sex outside of marriage and homosexuality with conservative Christian views.

Bishop C. Fitzsimmons Allison praised and partially credited Harmon for the rejection of Sexuality: A Divine Gift by the Episcopal General Convention.

[6]: 63  His 2005 article "Anglicanism at the Crossroads", in which he detailed a conservative Christian view of homosexuality's incompatibility with biblical scripture, appeared in The Guardian.

[48][49] Harmon also objected to the 2009 election of Thew Forrester, who practiced Zen Buddhism and amended the liturgy without approval.