 In 2001, he retired from the IDF.Since his retirement from the IDF, Arieli has been active in several left-wing organizations working to advance a permanent status agreement with the Palestinians.He is one of the heads of the Geneva Initiative and a member of the board of the Council for Peace and Security (on its behalf, he appeared before the High Court of Justice under the status of a "friend of the court" in the main petitions that were filed regarding the separation barrier and greatly affected its route) and a senior researcher at the Economic Cooperation Foundation NGO.