Texas State License Number C06179

About Us


Armed & Unarmed Security Officers
Security Consulting
Executive Security
Government Security
Commercial / Residential

Management Bios

Liana A. Marquis

Mrs. Marquis has more than 20 years of experience in the private security industry and directs the management and operations of Ameritex on a daily basis. All principle financial, personnel and administrative matters are reviewed and authorized by Mrs. Marquis. Along with her experience and day-to-day involvement in company operations, she is also constantly seeking new opportunities to expand Ameritex. As the primary executive in company operations, Mrs. Marquis sets company priorities and monitors overall performance of all company contract operations.

Robert E. Marquis
Executive Vice President

Mr. Marquis has been active in the management, operations and sales of private security services in the Dallas/Ft Worth, Houston, Austin and San Antonio markets since 1979.

Prior to his involvement with private security, Mr. Marquis was a top graduate of the U.S. Marine Corps Marine Security Officer School. He served as the second in command of the Marine Detachment, American Embassy in Paris, France  Mr. Marquis also served in various detachments and capacities in the Marine Corps until his retirement. 

Mr. Marquis is an active member of many professional and community organizations including American Society for Industrial Security (ASIS), and Associated Security Services and Investigators of the State of Texas (ASSIST).

As the Executive Vice-President, Mr. Marquis is responsible for the preparation of the business plan for submission to the President. His responsibilities include financing arrangements and review of company financial reports and participation at trade shows and conventions. 

Phillip Dennis
Vice President

Phillip entered the security field in 1990.  Mr. Dennis worked for Guardsmark in Business Development before joining American Protective Services.  He spent the next nine years with American Protective Services opening offices throughout the Southeast United States and Texas.  He helped grow APS into a national company widely recognized for providing quality services.  After APS was acquired by Securitas in 2000, Mr. Dennis worked in the human resources and employee benefits industry. He joined G4S in 2008 in Dallas, Texas where he worked as Business Development Manager.  He joined Ameritex Guard Services in November, 2011.

Mr. Dennis has responsibility for the overall day-to-day operations of the company. In this role he is responsible for oversight and development of marketing, operations, budget, profit/loss results and all reports required for the company owners.

Erica Lewis
Human Resources Manager

Erica Lewis joined Ameritex Guard Services in 2011 and brings with her over 10 years of Human Resource and client service experience. She is a graduate of the University of Texas at Arlington with a degree in Organization Leadership. Prior to working for Ameritex, Mrs. Lewis worked for an HR consulting firm, iSource Consulting Group, as a Human Resource Manager. Other positions she has held are Inside Sales, Recruiter and assistant to the CEO. Mrs. Lewis specializes in human resources issues, infrastructure and development. Her goal here is to create functional workplace process and procedures in order to strategically align the human resources department with the goals, vision and philosophy of Ameritex Guard Services. Lewis is involved in her community and an active member of the Society for Human Resource Management and the National Association of Professional Women.

Carl B. Adams
Operations Manager

Carl joined Ameritex in February 2012, bringing with him over 32 years of law enforcement, security management, loss prevention and investigations experience.

After spending a number of years as a law enforcement officer working for both city and county agencies, he took a position with the U.S. Department of Energy. Carl spent 10 years managing overall Security Operations for high-profile defense contractors throughout the United States as well as training program management, development and implementation.

Prior to joining Ameritex, Mr. Adams was a Senior Operations Manager for a nationwide investigative firm where he managed operations and investigations throughout the country. He holds private investigator licenses in the states of Florida, Virginia, North Carolina and Texas.

Mr. Adams is a graduate of Bethany College in Dothan Alabama with a Bachelor of Science degree in Religious Education. He also holds the Certified Fraud Examiner (CFE) designation, as well as the Fraud Claim Law Specialist (FCLS) designation and the Fraud Claim Law Associate designation (FCLA).

His responsibilities include monitoring the day to day field operations for Ameritex, mentoring and motivation of the work force, officer training and development at all levels, problem solving, recruiting and customer service.


Ameritex Guard Services, Inc.
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