Ilan Shiloah, chairman of the leading ad agency McCann Erickson Israel, says he was the one who initiated and financed a controversial ad criticizing top members of the Israeli army brass.

Among the officers appearing in his ad were the former IDF spokesman Brig. Gen. (res.) Avi Benayahu, former IDF Chief of Staff Lieut. Gen. (res.) Gabi Ashkenazi and Lieut. Col. Boaz...