Digital agency WhittmanHart has had to change a lot since starting out as an IT consultancy in the mid-1980's. It didn't truly become an interactive agency until a merger in 2000, but since then it has become one of the largest independently owned digital shops. WhittmanHart sees its proprietary Persona process — which models customer segments — as its key strength. Click headline above to view WhittmanHart's full profile, complete with capabilities and company history.