Dr. David Greene, MD, PhD, MBA, is a pioneering leader in regenerative medicine and healthcare marketing. As a residency and fellowship-trained orthopedic surgeon, Dr. Greene transitioned from clinical practice to become the founder and CEO of R3 Stem Cell and US Lead Network, where he has revolutionized patient care and medical practice growth through innovative therapies and digital marketing strategies. He has authored two influential books on healthcare internet marketing, ranks among the top expert authors globally, and has been featured on the cover of Corporate Vision magazine for his impact on global regenerative therapies. Beyond his professional achievements, Dr. Greene is passionate about education, compassion, and continuous innovation.