Brand MarketingLeo Burnett Buys Stake in Amazon AdvertisingBy Aaron Baar|July 2, 2002ShareBy Aaron Baar|July 2, 2002ShareCHICAGO — Bcom3 Group unit Leo Burnett will buy a 35 percent stake in San Francisco-based Amazon Advertising. Terms were not disclosed.The two agencies share a client in Cincinnati-based Procter & Gamble. Amazon is taking the lead strategic and creative role on a new product launch for the Cincinnati-based marketer, and will utilize Burnett’s international network.Amazon’s other clients include National University, Torani Foods, Philips Electronics, and the Girl Scouts. With a staff of 20 and billings of around $25 million, Amazon will continue to be led by Millie Olson as president and Lynda Pearson as creative director. The agency is expected to remain independent for the near term. Adweek Adweek