The Physical Security Group

PSG Logo
Contact Us

Field Office (Frederick, MD) Hours
Monday - Friday: 7:00 am - 5:00 pm
Saturday: Closed
Sunday: Closed
Closed on all Federal Holidays

Corporate HQ
3302 Bywater Court
Herndon, VA, USA 20171
Field Office
5712-G Industry Lane
Frederick, MD, USA 21704


301-662-1838 (Frederick Office)
571-259-6881 (Mark Manduke - Mobile)
571-259-6888 (Robin McDaniel - Mobile)


703-262-7931 (HQ)
240-457-4052 (Frederick)

Mark Manduke

Robin McDaniel

General Mailbox and Resumes