Duane is the owner of Urban Defense LLC. In addition to being an active duty Law Enforcement Officer, Police Firearms Instructor, and life long firearms enthusiast, he holds numerous certifications in the subject matter, some of which is listed below.

• Maryland State Police Qualified Handgun Instructor
• MPCTC Certified Police Firearms Instructor (Handgun, Shotgun,  and Type 3 Rifle)
• MPCTC Certified General Instructor
• NRA Certified Firearms Instructor
• District of Columbia Certified Firearms Instructor
• FEMA certified Law Enforcement Active Shooter (LASER) Instructor
• ALERRT Certified Active Shooter Instructor
• Colt Certified M16 / AR-15 Armorer
• LWRC M6 Armorer
• Glock Advanced Armorer
• Remington 700 Rifle Armorer
• Force on Force Reality Based Training Instructor
• National Tactical Officers Association (NTOA) SWAT Command School graduate

Andrew attended Towson University where he played football, studied history, and graduated Cum Laude in 2006. 

Andrew then attended the University of Baltimore School of Law where he graduated Cum Laude in 2009. While at the University of Baltimore he was President of the Student Bar Association, and co-captain of the lacrosse team. Additionally, he interned with the Honorable Michael J. Finifter of the Baltimore County Circuit Court, and acted as a Rule 16 attorney with the Baltimore County State’s Attorney’s Office.

In 2010 he entered private practice, and opened The Law Office of Andrew B. Saller, P.C., which ultimately became Saller, Ernstberger, & McElroy. In that capacity he has been successfully representing numerous clients who have been charged with very serious crimes in both District and Circuit courts.