THE ESSENCE: Independent McGarryBowen, which launched in 2002 with Verizon Corp., keeps building a client roster that's the envy of both indie shops and holding companies alike. This is particularly notable when small independents are hot. Run by a foursome of network veterans-John McGarry, Stan Stefanski, Stewart Owen and Gordon Bowen-the agency is proof that demand for serious client service, coupled with solid creative, exists. McGarry-Bowen continued to expand in 2005, picking up new clients Brahma beer, Century 21 and Kraft Foods. All told, it claimed billings of $800 million.