In 1992, Koston first got sponsored by the "101 Team", and moved to Los Angeles, CA. He officially turned pro in 1993 when he joined the "H-Street Team". Koston was most known for his amazing Nollie-based and switch-based skills that seemed impossible during that time. His career has been highlighted by his 1st place in the 2000 Globe World Contest, X Games and Gravity Games, his 1st place win in the 2002Gravity Games Street, and his 1st place in the 2003X Games Street Competition, X Games Global Championship and Gravity Games. He was named ESPN Action Sports and Music Awards Skateboarder of the Year in both 2001 & 2002. Koston was in Yeah Right, and Mouse, both a Girl skateboard film, "Fully Flared", a Lakai skateboard film. and "éS Menikmati", a éS Footwear Film. In 2007, Eric and another pro skater and his longtime friend, Steve Berra, established the Berrics, a skate park and also a project dedicated for Street Skateboarder around LA. From there, some series like Battle of the Berrics (the competitive SKATE contest, held by them), Do A Kickflip (a series where Eric and the Pros hunting down many people who can and can't skate doing a Kickflip) and Battle Commander (the exclusive Pro Showcase in the Berrics) become famous in internet.