Lieutenant General John M. Jansen is currently serving as the Deputy Commandant for Programs and Resources (P&R).

Originally from Indianapolis, IN, he was commissioned via the Platoon Leaders Course Program in 1986 after graduating from Indiana University with a BS in Finance.  He was designated a Naval Aviator in January 1990 and assigned to Marine Fighter Attack Training Squadron (VMFAT) 101, for conversion training in the F/A-18 Hornet. 

In 1991, he reported to Marine Fighter Attack Squadron (VMFA) 251 for two deployments to the Western Pacific and a deployment to Aviano Air Base, Italy in support of Operations DENY FLIGHT and PROVIDE COMFORT over Bosnia-Herzegovina. In 1994, he reported to 2d Battalion, 8th Marines, for service as a Forward Air Controller and deployed to the Western Pacific.

In 1995, he reported to Marine Aircraft Group (MAG) 46 as the Group Logistics Officer then Operations Officer for VMFA-134 and graduated from Navy Fighter Weapons School (TOPGUN).  In 1998, he reported to VMFA-323 and deployed to the Persian Gulf on board the USS Constellation (CV-64) in support of Operation SOUTHERN WATCH over Iraq.  In 2000, he reported to VMFA-314 and deployed to the North Arabian Sea in 2001 aboard the USS John C. Stennis (CVN-74) in support of Operation ENDURING FREEDOM over Afghanistan.

In 2002, he reported to Marine Corps Command and Staff College. In January 2003, he reported to the Coalition Forces Land Component Command Headquarters, Camp Doha, Kuwait as the Deputy Chief, C3 Aviation in support of Operation IRAQI FREEDOM. In 2003, he reported to VMFA-251, as the Executive Officer and deployed to the Western Pacific. In 2004, he assumed command of VMFA-251, transitioned the squadron to a carrier-based squadron, and deployed in 2006 to the Arabian Gulf on board the USS Enterprise (CVN-65) in support of Operation IRAQI FREEDOM.

In 2006, he reported to the Defense Threat Reduction Agency, Darmstadt, Germany for a Joint assignment as an Arms Control Inspection Team Chief implementing the Treaty on Conventional Armed Forces in Europe.  In 2008, he reported to Rome, Italy for attendance in the NATO Defense College Senior Course.  In 2009, he reported to Okinawa, Japan as the Assistant Chief of Staff, G-3, 1st MAW. In 2011, he assumed command of MAG-11.

In 2013 he reported to HQMC as the Assistant Deputy Commandant for Programs, P&R. In 2015 he reported to III Marine Expeditionary Force as the Deputy Commanding General and Commanding General, 3d Marine Expeditionary Brigade. In 2017, he reported to National Defense University as the 44th Commandant of the Eisenhower School for National Security and Resource Strategy. In 2018, he reported to HQMC as the Deputy Commandant, P&R.  

LtGen Jansen has over 3100 flight hours with 2800 hours in the F/A-18 and over 480 arrested carrier landings. He was recognized as the 2006 Marine Tailhooker of the Year by the Tailhook Association. He is married to the former Ann Lorraine Jansen of Indianapolis, Indiana and has three children: Joe, Alexandra, and Gabrielle.