ESL Gaming Online, Inc.
Professional Gaming League
ESEA (formerly E-Sports Entertainment LLC), is an online community and service owned by ESL. ESEA exclusively organizes CS:GO competitions, including leagues, cups, and pick-up games, which are also protected by its proprietary anti-cheat. ESEA is among one of the most infleuntial organizations in Counter-Strike's history.
ESEA League began offering lessons to improve gaming skills in 2003 providing instruction in Half-Life, Counter-Strike, and Warcraft III.  ESEA created the first professional fantasy e-sports league in 2004.  ESEA began its league history with Counter-Strike, but later added Team Fortress 2 (TF2) a game which gained more popularity after its adaption to "Free-to-play" gaming.  ESEA's anti-cheat and player validation software has been adopted by other leagues as well.