John Hollinger began writing for ESPN.com in 2005. He is best known for his analytical work, including creating the Player Efficiency Rating (PER), a statistical rating of an NBA player's per-minute productivity. He's developed several other statistical measures in recent years, and his PER and team rankings are updated daily on ESPN.com.
Before joining ESPN, John authored four annual editions of the "Pro Basketball Forecast," which analyzed every NBA player and team and provided detailed advanced stats for each. He also contributes to ESPN the Magazine, ESPNews and the New York Sun.
His previous stints include work for SI.com and Oregonlive.com.