Cygnus Business Media, Nielsen Business Media, Reed Business Information and McGraw-Hill are joining 24/7's network.
Former CBS executive and MarketWatch co-founder Derek Reisfeld has been appointed Chairman of the new venture.
24/7's digital media offering consists of over 1,500 sites serving ad impressions in countries around the world. 24/7 Real Media's network reaches around 150 million unique viewers each month.
--Gavin O'Malley