Fr. John moved to Boston in 1995, where he was appointed Professor of Theology at [[Holy Cross Greek Orthodox School of Theology (Brookline, Massachusetts)|Holy Cross School of Theology]], directed the Religious Studies Program at [[Hellenic College (Brookline, Massachusetts)|Hellenic College]] until 2002, and established the Environment Office there in 2001. In May 2008, he delivered the 8th Annual SS. Cyril and Methodius Lecture at St. Paul’s Seminary in Pittsburgh, Pennsylvania. His lecture, “Remembering Sacred Silence”, touched on the subtle variations of solitude, silence and stillness in the Letters letters of Barsanuphius and John.

The He is the author of several numerous books and numerous articles in several languages on the Church Fathers and Orthodox Spiritualityspirituality. ==Works==*''Beyond the Shattered Image: Insights into an Orthodox Christian Ecological Worldview'' (revised ed., Fr2007). John’s publications include “Cosmic ISBN (1999 ed., ISBN 978-1880971420)*''Cosmic Grace, Humble Prayer: The Ecological Vision of the Green Patriarch” Patriarch Bartholomew I'' (Eerdmansrevised ed., 2003; 2nd 2009). ISBN 978-0802862617.*''In the Heart of the Desert: The Spirituality of the Desert Fathers and Mothers'' (revised ed. forthcoming, 2008) and “Beyond . ISBN 978-1933316567. (2005 ed., ISBN 978-0941532518).*''John Climacus: From the Egyptian Desert to the Shattered ImageSinaite Mountain'' (2004). ISBN 978-0754650409.*''Light Through Darkness: Insights into an The Orthodox Christian Ecological Worldview” Tradition'' (2004). ISBN 978-1570755484. *''Love, Sexuality, and the Sacrament of Marriage'' (Light 2005). ISBN 978-1885652034.*''Repentance and Life, 2nd edConfession in the Orthodox Church'' (1990). ISBN 978-0917651564. 2007*''Soul Mending'' (2005). ISBN 978-1885652478.