While CEOs in corner offices nationwide may well consider the brief list of activist investors that follows to be a rogues’ gallery anyone who dismisses these four as nothing but troublemakers is missing the point entirely. Carl Icahn: One of the original agents provocateur of activist investing Icahn made his name as a “corporate raider” back in the 1980s before venturing into the more nuanced world of the activists. His targets have included Texaco Time Warner (NYSE:TWX) and Yahoo (NASDAQ:YHOO) and his personal fortune is estimated to be north of $14 billion. Right now his investments include Chesapeake Energy ...