What: Chairman-chief experience officer Where: Slack and Co., Chicago Why: Under Slack’s leadership, Slack and Co. won new b2b accounts including Ag Connect, Gates Corp., Honeywell Analytics, Invenergy, Society of Actuaries and ZS Associates. Among its major campaigns: “The World’s Toughest Shredders” for Fellowes; “Google Analytics Premium” for Google; and “Dow Corning Construction” for Dow Corning.