Dr. Daniel Paul Duggan is a board-certified orthopaedic surgeon specializing in sports medicine, advanced arthroscopy, shoulder and knee reconstruction, and general orthopaedics. He earned his Bachelor of Science in Biology with a minor in Chemistry from the University of Rhode Island in 2000, where he was recognized as an NCAA Atlantic 10 Scholar-Athlete. He subsequently obtained his Doctor of Osteopathic Medicine (DO) from the University of New England College of Osteopathic Medicine in 2005. Dr. Duggan completed his osteopathic internship at the University of Medicine and Dentistry of New Jersey (UMDNJ) School of Osteopathic Medicine in 2006, followed by residency training in general and plastic surgery at York Memorial Hospital in 2007. He then completed his orthopaedic surgery residency at UMDNJ in 2011, earning both the Outstanding Orthopedic Resident Paper Award and the Resident Service Award. To further refine his surgical subspecialization, he completed a fellowship in sports medicine, shoulder surgery, and arthroscopy at The Sports Clinic in Laguna Hills, California, in 2012.

Following his fellowship, Dr. Duggan joined The Sports Clinic, Orthopaedic Medical Associates, Inc. as an orthopaedic sports surgeon from 2012 to 2015. Concurrently, he provided sports surgery care with Kaiser Permanente Medical Group in Irvine from 2012 to 2019. In November 2015, Dr. Duggan established OC Sports & Orthopaedics in Mission Viejo, California, where he continues to serve as Owner and Principal Orthopaedic Surgeon. He maintains active hospital privileges across several Southern California medical centers, including Mission Hospital Laguna Beach, Saddleback Memorial Medical Center, and UCI Placentia-Linda Hospital.

Dr. Duggan is certified by the American Osteopathic Board of Orthopaedic Surgery, holds a Certificate of Added Qualifications (CAQ) in Orthopedic Sports Surgery, and is a Fellow of the American Academy of Orthopaedic Surgeons (FAAOS). A published researcher on hip arthroscopy outcomes and shoulder surgical techniques in peer-reviewed journals such as Orthopedics, he is an active member of the Arthroscopy Association of North America and the American Orthopaedic Society for Sports Medicine, as well as an Eagle Scout.