Defend 13, LLC specializes in delivering strategic advisory security services aimed at enhancing individual and organizational resilience. Its comprehensive portfolio includes expertise in counter-threat mitigation, executive protection consulting, and counter-surveillance strategies.

Mark brings a wealth of knowledge and experience to the table, honed during his tenure as a Deputy U.S. Marshal in Miami, Houston, and Dallas. His responsibilities ranged from safeguarding the federal judiciary to supporting the Witness Protection Program and contributing to high-threat operations within the Special Operations Group (SOG) of the U.S. Marshals Service. Mark also shared his expertise internationally, instructing foreign counter-terrorism personnel as part of the U.S. State Department’s Anti-Terrorism Assistance Program (ATA), as well as teaching protective operations at the International Law Enforcement Academy (ILEA) – El Salvador.

Transitioning to the U.S. Secret Service, Mark served as a Special Agent from 1996 to 2014 across various locations including Dallas, Washington, D.C., Crawford, and Waco, Texas. In this role, he led critical protective operations for Presidents of the United States and foreign dignitaries. Notably, Mark provided close protection, logistical support, and security advances for President George W. Bush during his tenure in the Presidential Protective Division. Additionally, he served as a Team Leader within the Counter Assault Team (CAT), providing tactical operational support to the Presidential Protective Division.

Mark's career also encompasses supervising and conducting diverse criminal and protective intelligence investigations for over twenty-six years. Following his service in the Presidential Protective Division, Mark served in the role of the U.S. Secret Service's training coordinator for Protective Detail Training (PDT), preparing 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.

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