Head Instructor


Krav Maga 2nd Degree Black Belt

1st Degree Brazilian Jiu Jitsu Black Belt

AMOK! Instructor

Sean has the distinction of being one of the first people to hold simultaneous Black Belts in Brazilian Jiu Jitsu and Krav Maga. There are less than a dozen people in the world who have reached this goal.

Sean currently teaches multiple audiences ranging from law enforcement and military to civilians. Our programs teach men and women of all ages how to defend and protect themselves in real life situations, as well as give people a way to get in shape and advance their training. Sean regularly does group classes, private and corporate training, law enforcement military and security training and consulting

Brazilian Jiu Jitsu Black Belt

Andrew Stewart

Professor of Brazilian Jiu Jitsu Under Professor Sean Stoopman & Tom DeBlass


Andrew is an active competitor and a very technical Black Belt in Brazilian Jiu Jitsu. Andrew has a long competitive track record with a extensive string of gold medals in advanced Gi & No Gi  divisions .  Known as a leg lock specialist focusing on No Gi competitions, he is sought out for knowledge of competition and has built his game around the submission only format.   

1st Degree Brazilian Jiu Jitsu Black Belt

Phil Zierke


Phil joined Silverback Academy in 2019 bringing with him an immense technical knowledge, especially in the modern lapel guards.  Both a technical instructor and grappler, Phil leads the advanced drill classes.  Phil was promoted to 1st Degree Black belt under Professor Tom DeBlass in August 2020 

BJJ Purple Belt Instructor


Brazilian Jiu Jitsu Purple Belt
Level One Filipino Martial Arts Instructor
Level One Jeet Kune Do Instructor

Alexa first began her Krav Maga training in 2012 at Silverback Academy. Alexa has achieved her Green Belt in Krav Maga, and is a Level 1 FMA Instructor and Level 1 JKD instructor under Sifu Roy Harris, a Brazilian Jiu Jitsu purple belt under Professor Tom DeBlass and Sean Stoopman.  Alexa now focuses her time on training Brazilian Jiu Jitsu and teaching the womens class. 

Brazilian Jiu Jitsu Black Belt

Ivan Joined Silverback Academy in 2017 as a Brown belt with an already technical knowledge of the Gi game, and a very strong guard passing back ground.  He has rounded his Jiu Jitsu out with more No Gi experience in the past three years, as well as continuing to excel technically in the GI.  This August 2020 Ivan was awarded him Black Belt under Sean Stoopman and Professor Tom DeBlass after 15 years of dedication to the sport of Brazilian Jiu Jitsu

Ivan Pena


14740 Flint Lee Rd, Suite F Chantilly , VA 20151, USA

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