"Sambo Steve" Koepfer is a leading sambo coach in the US. His Influence won him a technical advising role for the action-thriller film series John Wick. Stephen talks about rule-sets: sambo as a minority sport in the world of submission grappling; throws and leglocks for jiu-jitsu; and his training in Russia / Eastern Europe. 

Stephen Koepfer

https://www.instagram.com/sambosteve/

http://www.nycombatsambo.com/

https://vimeo.com/ondemand/nycs