Southern California Sinus Institute is the premier sinus center serving the greater Los Angeles, San Fernando Valley and Thousand Oaks areas. Southern California Sinus Institute specializes in the medical and surgical treatment of patients with various nasal and sinus disorders including nasal obstruction, environmental allergies, acute and chronic sinusitis, nasal polyps, and sinus headaches. Alen N. Cohen, M.D., F.A.C.S., a board-certified Head and Neck Surgeon and recognized leader in the field, is founder and director of the Southern California Sinus Institute.