ALEXANDRIA, Va. (AP) — A civilian interrogator who worked 20 years ago at the infamous Abu Ghraib prison in Iraq denied abusing detainees Thursday, and told jurors he was actually promoted for doing a good job.

Steven Stefanowicz, who worked for military contractor CACI when he was assigned to Abu Ghraib in 2003 and 2004, has long been a key figure in the abuse scandal that emerged when photos became public showing U.S. soldiers smiling as detainees were forced into shocking poses of physical and sexual humiliation.

While multiple soldiers were convicted and sentenced to prison in courts-martial for their roles at Abu Ghraib, neither Stefanowicz nor any other civilian contractor who worked at the prison has ever been charged with a crime.

Stefanowicz’s testimony Wednesday and Thursday in front of a federal jury in Alexandria comes as his former employer defends itself in a civil suit brought by three Abu Ghraib survivors who allege that CACI’s interrogators share responsibility for the abuse they endured.