Chicago—Slack & Co. has acquired Metrica B2B, a b-to-b demand-generation consulting company. Financial terms of the deal were undisclosed. Metrica will become part of a new unit of Chicago-based b-to-b agency Slack. As part of the deal, Keith Sullivan, founder of Metrica B2B, will lead the new unit at Slack & Co. and serve as an account director at the agency.