The book provides a framework for diagnosis and treatment of the complex facial deformities found in craniofacial microsomia and Treacher Collins syndrome. These conditions are difficult to treat due to their complexity and variable presentation. The deformities may be mild or severe and merely cosmetic to life-threatening in nature. These conditions often manifest as complex facial deformities that require multiple surgical interventions. Timing is critical when treating these patients and knowing and choosing the correct operation is key to successful outcomes.