Two of the nation's largest barge companies are changing leadership. Mark Knoy, 52, is leaving AEP River Operations to become president and chief executive officer of American Commercial Lines, based in Jeffersonville, Ind. David Huls has been named senior vice president and chief financial officer. Huls, 45, after having served as president and CFO at PBH Marine Group, which like American Commercial Lines is owned by Platinum Equity and operates a fleet of about 130 ...