Mr Guest is a member of the following associations:

• Association of Facial Plastic Surgeons
  
• British Association of Oral and Maxillofacial Surgery
  
• European Association of Cranio-Maxillofacial Surgery
  
• International Association of Maxillofacial Surgery
  
• European Association of Facial Plastic Surgeons
  
• Executive Board Member of Association of Facial Plastic Surgeons