Justin is a Consultant and Professional Lead for Speech and Language Therapy (SLT) at the Royal Marsden NHS Foundation Trust (RM) in London. He is also a senior member of the Applied Health Research Group and leads the survivorship theme for the International Centre for Recurrent head and Neck Cancer (IReC) at RM. From 2016-2026, he established and led a dedicated SLT service at Imperial College Healthcare NHS Trust supporting the National Centre for Airway Reconstruction and complex laryngology service and continues to manage a busy laryngology practice in the private sector. He is a Professor of Practice in Speech and Swallowing Rehabilitation in the Department of Surgery and Cancer at Imperial College London.
Justin has been an investigator on several research studies, including NIHR portfolio studies. He is chief investigator on the NIHR-funded CONSIDER Study. He has published extensively and contributed to key policy and position papers, acting as an expert adviser to several national organisations. He was the Allied Health Professions Council Member for the British Association of Head and Neck Oncologists and is currently SLT Council Member for the British Laryngological Association. He is President of the UK Swallowing Research Group. Justin was awarded the Fellowship of the Royal College of Speech and Language Therapists in 2018 and an MBE in the 2022 Queen's New Year's Honours in recognition of his contribution to the SLT profession.
Dr. Day currently serves as the National Director of Head and Neck Oncology for the Sarah Cannon Cancer Network and provides multidisciplinary head and neck cancer care at Head and Neck Specialists of South Carolina. He earned his medical degree from the University of Oklahoma and completed his residency at Louisiana State University, followed by fellowships in head and neck oncologic surgery at the University of California, Davis Medical Center and in craniomaxillofacial surgery at Inselspital–Bern in Bern, Switzerland. Following his fellowship training, Dr. Day joined the faculty at Vanderbilt University Medical Center in the Departments of Otolaryngology–Head and Neck Surgery and Neurosurgery. He later joined the Medical University of South Carolina, where he was named Professor, Vice Chair, and Director of the Division of Head and Neck Oncologic Surgery. He also served as Director of the Head and Neck Tumor Center at Hollings Cancer Center and held joint appointments in the Departments of Craniofacial Biology and Stomatology, as well as the College of Graduate Studies.
Dr. Day is deeply committed to patient advocacy and professional leadership. He serves as Chairman of the Board for the international nonprofit Head and Neck Cancer Alliance, Inc., and in 1998 founded the inaugural international Oral and Head and Neck Cancer Awareness Week, which has now spanned more than 25 years of education and advocacy efforts worldwide. His leadership roles include serving as President of the American Head and Neck Society, as a member of the inaugural Council of the International Academy of Oral Oncology and completed a four-year term on the Board of Directors of the American Academy of Otolaryngology–Head and Neck Surgery. He has also served as a Senior Examiner for the American Board of Otolaryngology and as a member of the National Cancer Institute Head and Neck Steering Committee, the RTOG Head and Neck Subcommittee, and the American College of Surgeons Oncology Group Head and Neck Working Group. Additionally, he was the first statewide director of the Council of the South Carolina Cancer Alliance.
An accomplished clinician-scientist, Dr. Day has been active in both clinical and translational research as a principal investigator or co-investigator in more than 25 clinical trials. He has received numerous research grants and public health advocacy awards, edited four textbooks, and authored over 200 peer-reviewed publications. He remains committed to global health education and clinical outreach, participating in volunteer efforts in Haiti, Africa, and other developing healthcare settings worldwide. Outside of his professional work, Dr. Day enjoys spending time with his family, exploring new cultures around the planet, running on the beach with his dog, and snowboarding in fresh powder.