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Hammers was born at Bitburg. During his childhood he lived in Mürlenbach, Eifel. He studied philosophy and theology in Trier. He wanted to become a Roman Catholic priest. During his university studies he met his wife. He married and the family has two children. Hammers stopped to become a priest and studied psychology. He worked in Roman Catholic Diocese of Trier as teacher for Roman Catholic priests in divinity school. As professor Hammers worked in sector pastoral psychology.
On 21 November 2007 Hammers retired as professor.
- Parapsychologie und Theologie, 1975
- Christlicher Glaube ... und praktizierter Unglaube, Erfahrungen und Anmerkungen eines Psychotherapeuten, 1996
- Der Spiegel:Angst vor den Schwulen. Homosexualität unter katholischen Klerikern,1997