Dr. Marchack graduates from the University of Southern California, School of Dentistry in 1971. In 1989, he received his MBA from the UCLA Graduate School of Management. Dr. Marchack belongs to numerous professional organizations including the American Prosthodontics Society, the Academy of Prosthodontics, the Pacific Coast Society for Prosthodontics, the International College of Prosthodontists, the Academy of Osseointegration, and the American Academy of Esthetic Dentistry. He is a fellow of the American College of Dentists, a Fellow of the International College of Dentists, a fellow of the Pierre Fauchard Academy, and a dellow of the Academy of General Dentistry. He presently serves on the board of councilors of the USC School of Dentistry and is vice chairman of the editorial council for the Journal of Prosthetic Dentistry. He maintains a private practice in Pasadena, California with a focus on esthetic, restorative and implant dentistry.