Team
It starts at the top...
ABC’s mission is to provide “Superior Security Service.” With this commitment in mind, ABC has assembled a managerial team that is professional and dedicated to success. Our managers are skilled and tested veterans who consistently meet the challenges presented in the changing world of security and loss prevention.
When partnering with ABC you have the full commitment of our executives and managers, who will help ensure that our security personnel and support staff provide the optimum level of service that you have come to expect from ABC Security Service, Inc.

Ana Chretien, President, Owner

Ray Thrower, General Manager Emeritus, Consultant

Clinton Grant, Operations Manager

Erica Cervantes, Schedule Manager

Ms. Ahumada is ABC’s Management Scheduler. She is responsible for maintaining control of the weekly schedule of nearly two hundred guards. This complex process is computer automated to ensure that properly trained personnel are assigned to specific work sites. Ms. Ahumada is very familiar with our employee-client pool. She has the unique skill and innate ability to match specific personnel with the special needs and requisites identified by our clients. Under Ms. Ahumada’s watchful eye you are assured of an efficient and timely response.
Email Erica Ahumada
Isiaka Hassan, Supervisor & Assistant Operations Manager
Mr. Hassan has been with ABC Security since Mid-2022. He has a strong background in security since he was a freedom fighter in his country of origin. Mr. Hassan graduated from the University of IIorin in Kwara, Nigeria with Engineering Degrees. Given his extensive background in responsible positions in Civil and Structural Engineering, he is well able to cultivate client relationships, be decisive, and solve complex problems.
Jewhara Mesmer, Executive Assistant, Contract & Billing Manager

Ms. Mesmer came to ABC Security in 2017. She has a strong work ethic and knowledge of security operations which has been a great help to the ABC team. Ms. Mesmer’s background in Security comes from her military service in her country of origin, and she has excellent computer skills as well. Ms. Mesmer’s Primary ongoing responsibility is as Assistant to the President of ABC, plus billing, overseeing contracts, and job performance analysis. She interacts with clients to ensure client satisfaction.
Communications Service Center
Our headquarters based 24/7 Communications Service Center is staffed with well-trained, experienced dispatchers who handle calls around the clock in a professional and efficient manner. Our Executive and Headquarters Management plus dedicated staff are on call 24/7 making them available to the dispatcher & our clients.
Our Friendly Back Office Staff



We Miss Her
This photo is confirmation of how much we miss our long-time Day Shift Dispatcher Gayle Tselentis (11/47 – 11/22).

PPO License # 6773
1840 Embarcadaro, #100
Oakland, CA 94606
Phone: 800-872-1666
Fax: 510-436-0826