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Security Camera

Protect & Preserve

Our Services


Risk Mitigation


Threat Assessment






SDM is a full-service security company and security consulting firm. We are licensed by the State of California, Department of Consumer Affairs-Bureau of Security Investigative Services (B.S.I.S.). We offer our clients a wide spectrum of capabilities, including risk mitigation, threat assessment, consulting, training and investigative programs. We provide professional and effective security solutions and state certified training. We specialize in armed and unarmed services, high-level corporate & executive protection, estate security, close-quarter protection and specialized projects on a case-by-case basis.


SDM takes a layered approach to security. We analyze vulnerabilities and close the gaps in security utilizing the most modern and advanced techniques, such as physical and structural enhancements, access control gates, fencing, lighting, advanced communication and surveillance systems (including Unmanned Aerial Vehicle surveillance). We analyze the threat to personnel and assets within the context of the “big picture” in order to access the type and level of security to be deployed. Every client and each situation are unique therefore, each client requires solutions specific to their needs. Our goal is to provide those solutions to address the specialized needs of our clients. SDM excels in customer service and client satisfaction!

Our Staff

Meet Our Staff

steven mohr.jpg

Steven E. Mohr


Steven has several years of law enforcement experience and is currently active in his profession. He has served with five different police agencies at the state, municipal, educational (school police) and “Special District” levels in Southern California. He began his law enforcement career in 1983. He holds several police certifications, including many as an instructor, including Active Shooter Defensive Instructor and American Red Cross CRP/First Aid Instructor.

Sonia Rodriguez

Vice President

Sonia has been with SDM since its inception in April 2003. Sonia has an extensive background in banking/finance, having worked for two major commercial banks and two credit unions, where she last served as a Senior Loan Officer. She is heavily involved with company strategic planning, as well as, serving as human resources and payroll coordinator. Sonia is an active Rotarian, participating in various volunteer humanitarian projects both locally and internationally.

Robert E. Tilley, Jr.

Operations Director

Robert joined SDM in October 2009 as a line officer. He was promoted to Operations Director in January 2012. Robert is a key part of the management team and oversees high-level duties such as recruitment, hiring and training standards. He is also responsible for analyzing and improving organizational processes, and improving quality, productivity, and efficiency. Robert is a veteran, having served in the US Marine Corps for two tours of duty from 1986 to 1993. He is a CA P.O.S.T. certified officer in Laws of Arrest and Firearms and Chemical Agents.

SDM not only hires professionals, they train them, as well. California state law requires that any person wishing to be employed in the security field be licensed by the state. Also, they must complete mandatory continuing education courses initially, and annually (AB 2880).


These licenses and certificates are issued and/or approved by the Bureau of Security and Investigative Services (B.S.I.S.), which is regulated by the Department of Consumer Affairs. SDM has been granted licenses to certify and train individuals in all areas of security services regulated by B.S.I.S., including the initial 40-hour and 8-hour annual continuing education requirements under AB 2880.



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214 Main Street Ste. #162 El Segundo 90245


SDM holds the following state licenses and instructional certificates:

City of El Segundo Business License – 21403
State of CA Private Patrol Operator License – PPO 15247
State of CA Firearm Instructor License – TIF 1674
State of CA Firearm Training Facility License – TFF 1134
State of CA Baton Instructor License – TIB 1643
State of CA Baton Training Facility License – TFB 1099

State of CA Chemical Agent Instructor License
TASER (Less than Lethal) Instructor Certification
American Red Cross CPR/AED and Standard First Aid Instructor Certification
State of CA Bureau of Security and Investigative Services
DOJ Approved Firearm Instructor
DOJ Approved Chemical Agent Certification – OC/CS
NRA Instruction & Certification

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