Gregory D Lilyhorn

Mr. Gregory D Lilyhorn

Experteer Services LLC
5820 Alpha Road, Suite A,
Dallas , TX 75240
Mobile: 214-499-6800
Office: 214-396-4411


Gregory D. Lilyhorn is an experienced subject matter practitioner who has successfully assisted both Plaintiff and Defense in matters concerning adequacy and or negligent in liability matters concerning security management, crisis security management, physical security, healthcare security, security training, security procedures and in workplace violence including terrorism.

Areas of Expertise

  • Crime Foreseeability
  • Hospital Security
  • Inadequate/Negligent Security
  • Law Enforcement
  • Premises Liability
  • Private Investigators
  • Security Guards
  • Security Management
  • Terrorism
  • Workplace Violence

Expert Background

Q: Please list your professional accreditations, degrees, licenses, and certificates granted:
A: Mr. Lilyhorn is a fully bonded and qualified state licensed security consultant, private investigator and security company manager (#C17560). He is certified by the American College of Forensic Examiners Institute as a Legal Forensics Consultant (CFC) and Certified Criminal Investigator (CCI) and is Reid Institute Qualified in Advanced Interviewing Techniques (CFI). American Board for Certification in Homeland Security, Sensitive Security Information Specialist (SSI) for the protection of documents and Homeland Security Consultant (CHS-III) in terrorism and WMD Issues, Certified as an Anti-Terrorism Specialist (CAS) by the ATAB-Anti-Terrorism Accreditation Board. He also holds "Accreditation" from ASIS International (American Society for Industrial Security), which is recognized by federal law (SAFETY Act) to protect the protector and his clients in law suits regarding work done for protection against terrorism. He was also awarded accreditation by both the leading national threat and risk assessment methodology groups in the United States, the National Domestic Preparedness Coalition’s, HLS-CAM™ methodology and the National Domestic Preparedness Consortium risk methodology, Texas Engineering Extension Service.
Additionally Mr. Lilyhorn is a retired federal law enforcement officer having served over twenty years with the U.S. Federal Protective Services a branch of the U.S. Dept of Homeland Security. He is a graduate of the Federal Law Enforcement Training Center, Nebraska Law Enforcement Training Center, Kansas Law Enforcement Training Center and the USAF Security Police Training Center. He holds National Law Enforcement Officer Accreditation from the National Commission on Professional Law Enforcement Standards, Washington D.C., and a Bachelor of Science Degree in Criminal Justice Administration University of Nebraska. Comprehensive pre-law criminal justice program (BSCrJ) with no minor studies with membership in the American Criminal Justice Association “Lambda Alpha Epsilon” Society. Military Service: Security Police Specialist United States Air Force - Regular, Reserve and Army National Guard Service,(Vietnam Era Veteran).
Q: Please list your affiliations or memberships in any professional and/or industry organizations:
A: As a practicing professional Mr. Lilyhorn continues advancing his expertise with additional educational participation in such organizations as the; International Association of Professional Security Consultants, the International Association of Healthcare Security & Safety, International Police Association, Association of Certified Fraud Examiners, National Fire Protection Association, International Association of Security & Anti-Terrorism Professionals, Texas Association of Licensed Investigators, Downtown Dallas Security Directors Association, North Texas Crime Commission, the American Board for Certification in Homeland Security, the American College of Forensic Examiners International, Anti-Terrorism Accreditation Board, Int'l Foundation for Cultural Property Protection, InfraGard: FBI/Private-Sector Alliance, Office of Infrastructure Preparedness, Overseas Security Advisory Council, and the American Society for Industrial Security. He has received numerous professional and patriotic awards and honors for his professional efforts in law enforcement and professional consulting. He is the recipient of the prestigious National Law Enforcement Officer Accreditation from the National Commission on Professional Law Enforcement Standards, Washington D.C. and has been honored for his 9/11/2001 and Hurricane Katrina efforts. He was also honored in 2002 with the J. Edgar Hoover Memorial Award for Distinguished Public Service, the Honor Award for Distinguished Achievement in Public Service. Upon his federal retirement he was honored with the National Law Enforcement Patriotism Award and the Distinguished Law Enforcement Service Award.
Q: Please list any teaching or speaking experience you have had, including subject matter:
A: Mr. Lilyhorn is an accomplished educator and trainer in the fields of law enforcement, investigation and corporate security. He is an Adjunct Professor Dallas Community Colleges and University of Texas – Dallas. He is Listed in Marquis Who’s Who Directory which is a listing for colleges, universities, and public library directories world-wide in recognizing successful individuals in varying areas of professional expertise. He is also licensed by the Texas Commission on Law Enforcement Officer Standards and Education as a Police Instructor and with the Texas Department of Public Safety as a Continuing Education Instructor. Also he is a fully Certified Instructor with the American College of Forensic Examiners and a licensed Handgun Instructor for Texas Concealed Handgun Licensing. Currently he a excellent “toastmaster" guest lecturer and speaker for a number speaking engagements for professional & community organizations, institutions, police/security academies, universities, community colleges, schools, corporations, businesses and private events.
Q: Have any of your accreditations ever been investigated, suspended or removed? (if yes, explain)
A: None - Inactive government security clearance - retired from government.
Q: On how many occasions have you been retained as an expert?
A: upon request
Q: For what area(s) of expertise have you been retained as an expert?
A: In 2013, Foreseeability Analysis, Personal Injury and Premises Liability Matters.
Q: In what percentage of your cases were you retained by the plaintiff?
A: 2012-2013 estimate 60%
Q: In what percentage of your cases were you retained by the defendant?
A: 2012-2013 estimate 40%
Q: On how many occasions have you had your deposition taken?
A: upon request
Q: When was the last time you had your deposition taken?
A: 2014
Q: On how many occasions have you been qualified by a court to give expert testimony?
A: State & Federal courts.
Q: On how many occasions have you testified as an expert in court or before an arbitrator?
A: upon request
Q: For how many years have you worked with the legal industry as an expert?
A: Beginning in 2004, Mr. Lilyhorn testified before the U.S. General Accounting Office Commission in related Homeland Security matters in 2004 and has contributed to the RAND Corporation in research projects concerning Homeland Security related matters in 2004 and 2005. (The RAND Corporation is a nonprofit institution that helps policy and decision making through research and analysis of trends and issues and continues to be on the cutting edge working with experts in both the public and private sectors.) Also in 2004, was appointed to the advisory broad for Security Intelligence for Total Corporate Alignment (SITCA) which was sponsored by University of Texas – Dallas and provides best practice expertise for overall public-private excellence and with the Texas Homeland Security Alliance a partnership of Texas companies involved in developing new technologies and methods for future improvements in Anti-Terrorism Defense.
Q: What services do you offer? (E.g.: consulting, testing, reports, site inspections etc.)
A: Assist plaintiff and defense attorneys in case preparation, prepare subject matter reports and testify at depositions and trials. (Service staff of experienced consultants and licensed forensic investigators in litigation support services.
Q: What is your hourly rate to consult with an attorney?
A: Fee schedule upon request
Q: What is your hourly rate to review documents?
A: Fee schedule upon request
Q: What is your hourly rate to provide deposition testimony?
A: Fee schedule upon request
Q: What is your hourly rate to provide testimony at trial?
A: Fee schedule upon request
Q: Please list any fees other than those stated above (E.g.: travel expenses, copy fees, etc.)
A: Travel expenses, copy fees, etc.


Michael S. Box, Atty.
Larry A Bruner PC
8118 Datapoint Drive
San Antonio, TX 78229

Michael "Rocky" Bochelle, Atty.
Mochelle McCullough, LLP
325 North Saint Paul Street
Suite 4500
Dallas, Texas 75201

Additional list of legal, corporate and other organizations references available upon request.