Located at 3392 Mendocino Ave. in Santa Rosa, NorthBay biz magazine is a monthly business-to-business publication covering Napa, Sonoma and Marin counties. This year, the magazine is celebrating 43 years of continuous operation. It originally hit the stands in 1975, when it was called Sonoma Business, and only covered Sonoma County. Norm and Joni Rosinski and John Dennis, acquired it in 2000 and changed its name to cover an expanded market. Today, the magazine is part of Amaturo Sonoma Media Group.