As a Jesuit, he undertook further studies at Fordham University and Woodstock College and was ordained a Roman Catholic priest in 1964.

His other works include Sartre and the Sacred (1974), Enchantments: Religion and the Power of the Word (1989), Merton: Mystic at the Center of America (1992) and Jung's Four and Some Philosophers (1999).

[4] In addition, Father King was presented as third in a series of cover stories regarding Jesuit identity in the Georgetown Voice on September 27, 2001.

King was also a member of Pax Christi and opposed war and capital punishment, though he stressed the peaceful prevention of conflict over strict pacifism.

On June 23, 2009, King died of heart attack in his bedroom at the Jesuit Residence at Georgetown University in Washington, DC.