One of the fastest-growing companies in the Northwest has little to do with high-tech, biotech, or cleantech. Tacoma, WA-based Sound Physicians owes its rapid rise to an innovative form of healthcare delivery that hospitals are flocking to as part of their ongoing quest to save money and improve patient care. Sound Physicians has got to be one of the hottest local growth companies that few have heard of. This privately held firm, founded in 2000, eclipsed $100 million in revenue last year, runs in the black, and has grown to more than 500 employees, with more than 400 of them physicians. The company doesn’t envision going public, although it is seeking to branch out from its core customer base in the Western states and Midwest to build a company that serves hospitals with physicians-for-hire from coast to coast.