Lieutenant Colonel Jackel is a Royal Australian Engineer who has served with the 2nd and 8th Combat Engineer Regiments, the Special Operations Engineer Regiment, the School of Military Engineering, the 1st Recruit Training Battalion, and the Combined Arms Training Centre. He is currently a member of the Army Joint Staff. He has an interest in the concepts around countering violent extremism and holds Masters Degrees in Terrorism and Security Studies, Military and Defence Studies, and Management.