High Quality Content by WIKIPEDIA articles! Andrew Left (born July 9, 1970, in Detroit Michigan) is a notable activist short seller and author and editor of the online investment newsletter Citron Research, formerly StockLemon.com. Founded in 2001, StockLemon.com changed its name to Citron Research in April 2007. Citron Research provides critical, short-focused stock market commentary. Left researches and short sells companies he believes to be engaged in fraud, have been suspiciously promoted, or have been mistakenly overpriced by the stock market.