Marcus founded Holling Enterprises in 2012.  A career Airman, he retired from the United States Air Force in 2025 after completing 20 years of honorable service.  He served in a myriad of roles in Aircraft Maintenance and Flight Safety in a Fighter Wing, and as a Tactical Communicator in a squadron attached to the Joint Communications Support Element (JCSE).  His career culminated managing Airfield Operations for the US East Coast's largest Combat Readiness Training Center in Savannah, GA.  His service spanned across roles as a Drill Status Guardsman, T10 Active Duty, T32 Active Guard-Reserve, and as a T32 Federal Air Technician (rank equivalent to CW4).  He deployed multiple times to locations worldwide in support of national objectives.

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As President, he oversees the strategic direction of the company.  He is responsible for setting the pace at which the company pursues and executes its contracts as well as its general operations.

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He holds degrees from the Community College of the Air Force and American Military University.

Additionally, he has completed advanced certificate coursework in Systems Acquisitions, Test & Evaluation, and Maintenance Management at Defense Acquisition University.  

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His personal logbook includes time in multiple fixed-wing and rotary-wing platforms.  He continues to add time to it as often as he can.

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He is completing coursework towards a Master's of Science degree in Systems Engineering at Johns Hopkins University's Whiting School of Engineering.

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His professional affiliations include membership in the American Institute of Aeronautics & Astronautics, ASTM International, and the Society of Flight Test Engineers (SFTE).  He is a Member of SFTE's Technical Council and is a Voting Member of the Aerospace Committee for ASTM International.