A knife designer needs a knife maker. Jeff Randall started Randall Adventure Training, aka R.A.T and those knives were at one time made by Ontario Knife Company. RAT split away from OKC, some knives were still made as RAT knives for a little while. Then, they decided to changed the name to avoid confusion, thus ESEE was born. ESEE knives are made by Rowen.
Becker Knives were made by Camillus at one time, but are now made by Ka-Bar. To my knowledge, the only relationship between ESEE and Becker seems to be one of friendly competition. Jeff and Ethan know each other, and I've read some old posts where they were having fun insulting one another's knives, in a good natured way.
Oh yeah, I forgot about that knife, I own the BK-14!