Dr. Daisuke Sakai is a Professor and Clinical Department Chief of the Department of Orthopaedic Surgery at Tokai University School of Medicine in Kanagawa, Japan. He is an internationally recognized orthopaedic spine surgeon and researcher specializing in spinal surgery, spinal deformity, degenerative spine disease, and regenerative medicine. His research focuses on intervertebral disc biology, stem cell therapy, and cellular regeneration for degenerative disc disease. Dr. Sakai has authored more than 200 peer-reviewed publications and has delivered over 300 presentations and invited lectures worldwide. He currently serves in several major international leadership positions, including Secretary General of the International Society for the Study of the Lumbar Spine (ISSLS) and board member roles in multiple spine societies. His contributions to spine research and regenerative medicine have earned him numerous international awards and recognition.