Defend 13, LLC specializes in providing strategic advisory security services focused on enhancing resilience for individuals 
and organizations. Its comprehensive portfolio includes expertise in counter-threat mitigation, executive protection 
consulting, and risk mitigation strategies.
Before founding Defend 13, LLC, Mark served as the Chief Safety and Security Designee for Baylor University. He was 
responsible for the executive leadership and management of the Department of Public Safety, encompassing all 
operational university law enforcement, safety, and security branches, including the Police Department, Physical & 
Technical Security, Emergency Management, and Global Safety & Research Security.
Mark brings extensive knowledge and experience from his tenure as a Deputy U.S. Marshal in Miami, Houston, and 
Dallas. His duties included safeguarding the federal judiciary, supporting the Witness Protection Program, and 
contributing to high-threat operations within the Special Operations Group (SOG) of the U.S. Marshals Service. 
Additionally, he provided international instruction to foreign counter-terrorism personnel through the U.S. State 
Department’s Anti-Terrorism Assistance Program (ATA) and taught protective operations at the International Law 
Enforcement Academy (ILEA) in El Salvador.
In his subsequent role as a Special Agent with the U.S. Secret Service from 1996 to 2014, Mark operated across various 
locations, including Dallas, Washington, D.C., Crawford, and Waco, Texas. He led critical protective operations for U.S. 
Presidents and foreign dignitaries, notably providing close protection, logistical support, and security advances for 
President George W. Bush within the Presidential Protective Division. He also served as a Team Leader for the Counter 
Assault Team (CAT), offering tactical operational support to the Presidential Protective Division.
Mark's federal law enforcement career encompasses over twenty-six years of supervising and conducting diverse 
criminal and protective intelligence investigations. Following his service in the Presidential Protective Division, he 
became the U.S. Secret Service's training coordinator for Protective Detail Training (PDT), where he prepared presidential 
candidate protective details for the 2008 U.S. Presidential Campaign.
Mark retired from the U.S. Secret Service in 2014 as a Supervisory Special Agent. He holds a Master of Criminal Justice 
from Boston University and is recognized as a Master Peace Officer and School Security Consultant in the State of Texas.