600 E. Las Colinas Boulevard, Suite 110
Irving, Texas 75039
PHONE: (214) 377-9177
FAX: (214) 377-9073



Mr. Lumby joins Marksman Security with 17 years of experience in the security industry. Prior to joining Marksman, Mr. Lumby led the Dallas market for a national security company. Before moving to Dallas in 2005, he was assigned as District Manager responsible for operations and development in Maryland, Southern Pennsylvania, Northern Virginia, West Virginia and Washington, D.C. Mr. Lumby’s leadership and security experience have helped him create strong customer relationships based on honesty, integrity and value-added services.

Mr. Lumby’s Security experience includes: Class A Commercial Real Estate, Corporate Campuses, Biotechnology, Education, Financial Services, High-Tech Manufacturing, Distribution Centers, Healthcare, Residential HOA’s, High Value Cargo Escorts, Retail/Grocery, Energy (Oil & Gas), Pharmaceutical, Power, Maritime and Government & Defense.

Before transitioning into the security industry, Brian served in the U.S. Army for 21 years on active duty, retiring as First Sergeant. He started his military career as an enlisted soldier in 1983 at Fort Bliss, Texas. After serving in every enlisted rank from Private to First Sergeant, he culminated his career with the Army at Western Maryland College, McDaniel College and Mount Saint Mary’s College in Maryland, where he served as Chief Instructor for the Army’s ROTC Program.


University of Phoenix – Bachelor of Science in Business Management

Licensed as a Level III – Commissioned Officer, and Level IV – Personal Protection Officer, Private Investigator, Security Consultant, Qualified Manager through the State of Texas.

Brian is also an active member of ASIS International and the Dallas Building Owners and Managers Association (BOMA) Chapter.

Jake Heathman, Vice President of Operations

Jake Heathman, Vice President of Operations

Mr. Heathman joins Marksman Security with twelve years of senior leadership experience in the security industry. During the course of his career he has provided his expertise to clients in a variety of market segments including Residential Luxury Condos, Commercial Real Estate, Fortune 500 Corporate Campuses, Higher Education, Manufacturing and Healthcare. Mr. Heathman is a proven industry leader who champions a results-driven professional philosophy in all areas of security services business model. Mr. Heathman forged his knowledge of the security staffing industry while working in some of the most competitive and diverse markets in the United States.

Mr. Heathman has repeatedly demonstrated the ability to develop a best in class product for clients while never losing focus on the importance of supporting his internal teams. His dedication to teamwork and client satisfaction truly highlight his commitment to not only Marksman’s culture but it’s growth as well.

Mr. Heathman is a graduate of the University of Iowa, having earned a Bachelors Degree Finance, as well as another in Entrepreneurial Management.


What separates Marksman from other security providers is our unparalleled customer service, client-customized programs and superior operational support.