Dr. Anastassov has extreme training and expertise in the treatment of congenital and acquired craniofacial malformations, such as cleft lip and/or palate syndromes affecting craniofacial trauma, reconstructive surgery, and aesthetic surgery. Dr. Anastassov was privileged to train in some of the most respected educational programs in the United States and Europe. He is trained in oral/maxillofacial, plastic, craniofacial, and base of the skull surgery.

Dr. Anastassov has lectured extensively on topics ranging from oral implantology to aesthetics, reconstructive and trauma surgery in the United States, Colombia, Mexico, Germany, France, Switzerland, Scotland, Italy, The Netherlands, Romania, Bulgaria, Ukraine, Russia, and so on. The International Cleft Lip and Palate Foundation rate the cleft lip and palate center organized by Dr. Anastassov at the Elmhurst Hospital Center as a Center of Excellence.

Dr. Anastassov is an active member of the American Association of Oral and Maxillofacial Surgeons, European Association for Craniomaxillofacial Surgery, American College of Oral and Maxillofacial Surgeons, The International Cleft Lip and Palate Foundation, and the Hellenic Medical Society of New York. Dr. Anastassov serves on the editorial board and is a reviewer for the following peer reviewed professional journals: The Journal of Oral Surgery, Oral Medicine, Oral Pathology and Radiology (Triple O); The International Journal of Oral and Maxillofacial Surgery; and Folia Medica.