Dr. Guillermo Castillo is a fellow of the Royal College of Physicians and Surgeons of Canada in Otolaryngology and a fellow of the American Board of Otolaryngology – Head and Neck Surgery. He is a member of the College of Physicians and Surgeons of Ontario, the Ontario Medical Association, and a fellow of the American Academy of Cosmetic Surgery. He completed his medical education at the National Autonomous University of Mexico and completed his rotating internship at Dalhousie University in Halifax, Nova Scotia. He did his general surgery training at University of Ottawa and his residency in Otolaryngology at the University of Toronto. He did a post graduate fellowship in microvascular surgery at the University of Toronto. He subsequently became a fellow of the American Academy of Cosmetic Surgery and the American Liposuction Society. He has been in private practice since 1979. He is an active staff member at the Scarborough Health Network, Scarborough General Hospital, Rouge Valley Centenary Hospital, and Grace Hospital.

Dr. Guillermo Castillo is a cosmetic surgeon with 34 years of experience. He has participated as a speaker in 5 world congresses of cosmetic surgery (Australia, Norway, England, Argentina, Colombia). He also has spoken as a guest speaker at conferences for cosmetic surgery multiple times in the USA.