Ron Liebman from Flushing, NY is a long-time presence at SABR conventions, having attended over 90% of them. He is a baseball researcher who has done work for the SABR biographical committee. Liebman, or someone posing as him, has been banned from both the BR Bullpen and Wikipedia for repeatedly providing edits that are unsubstantiated. Additionally, Liebman or the person posing as him has repeatedly falsified their identity by using "sockpuppets" and anonymous IP addresses at both sites. See this Wikipedia thread about Liebman.