San Francisco Plastic Surgery With locations in San Francisco, Lake Tahoe and Berkeley, The Maas Clinic is a comprehensive aesthetic care center dedicated to quality patient care for aging and rejuvenation for the skin, face, and the body. Our board-certified Facial Plastic Surgeon, Corey S. Maas, M.D., F.A.C.S. is internationally recognized for his expertise in surgical and non-surgical management of the aging face and balancing facial features with rhinoplasty and facial inplant and contouring procedures. With a team of acknowledged experts in aesthetic and reconstructive breast and body surgery, TMC brings excellence and experience to Northern California cosmetic surgery practice. The Maas Clinic includes its own fully accredited, outpatient surgical facility The San Francisco Rejuvenation Center where quality, safety and privacy allow an unsurpassed level of patient comfort. The Appearance Care Center is a beautiful, state-of-the-art medical day spa offering non and minimally invasive “lunchtime” treatments. Whether you’re coming in for an initial consultation, a simple injection or a surgical procedure, your comfort, safety, and privacy are always paramount at The Maas Clinic. The mission of The Maas Clinic is to give men and women premier personalized care that combines both art and science for a result that is naturally beautiful—and beautifully you.