He has also served on the board of the American Anti-Slavery Group, and was a member of the Institute of Historical Research at the University of London.

[4] From 1986 to 1990, Eibner worked for the Keston Institute in London, an organization that monitored and promoted religious freedom in the former communist countries of Eastern Europe.

The atrocities Eibner witnessed there, including mass slaughter and slave raiding by government-supported militias, led him to describe the Sudanese government's campaign against the south as "genocide" in an October 1992 article for Wall Street Journal Europe.

[10] He has traveled to Iraq to deliver supplies to Christian refugees, document cases of anti-Christian violence, and meet with local church leaders.

Eibner has briefed senior policymakers at the White House and the State Department about religious persecution abroad, and has led delegations of lawmakers and journalists to critical areas in Sudan and Nagorno-Karabakh.