Coastal P&O Staff

We believe in providing the best Prosthetic & Orthotic care through individualized treatment plans, cutting-edge technology, resulting in positive outcomes. We have an in-house lab to fabricate all our products, so we can control the quality of our devices, along with ensuring all of our products are 100% made in the USA. We also take pride in our office, both in appearance and accessibility, to provide a warm, inviting environments for all our patients. We work hard in ensuring every patient’s experience here will be superior in all aspects.


We understand your need to receive treatment in a practice where you feel comfortable, safe, and welcome. Our newly designed practice features digital scanning, paperless charting, and utilizes the latest technologies to ensure patient comfort and to streamline treatment progress.

Emilia Avina

Patient Services Coordinator

Emilia Avina started with Prosthetic & Orthotic Group in 2017 in the Mission Viejo Office as their Patient Service Coordinator. She has been working in the Prosthetic and Orthotic field for over five years. Working side by side with clinicians and providers offices has inspired her to up hold the work flow of patient care contact and administrative insurance role. Emi loves to connect with all our patients’ and understands facilitating any strain/load when it comes to claims process will be greatly appreciated. She is known always be available with a smile and helping hand with all our patients.

Stephen Gaw

CPO Certified Prosthetist Orthotist

Mr. Gaw has been in the field of orthotics and prosthetics for over 10 years. Prior to entering the profession, he had worked for various corporations in the field of logistics and supply chain management. His previous education includes a Bachelor of Science in Industrial Engineering from Georgia Tech and a Masters of Science in Business Administration from Penn State University. He obtained his Master of Science in Prosthetics and Orthotics from Georgia Tech in 2008 and completed an orthotics residency in Atlanta the following year. In 2010, Mr. Gaw moved with his family to Southern California and worked in San Diego, specializing in pediatric orthotics and completing a residency in prosthetics. In 2014, he moved to Orange County and started his partnership with Chad Marquis.

While he is interested in all areas of orthotics and prosthetics, Mr. Gaw especially enjoys working with pediatric patients. His specialties include management of scoliosis and cranial remolding helmets. He has personal experience in remolding helmets as his own son wore one due to brachycephaly. Mr. Gaw has presented at professional conferences on scoliosis research and currently guest lectures at the California State University Dominguez Hills O&P program.

In his free time, Stephen enjoys spending time with his wife, and twins Micah and Autumn. He is an avid sports fan, enjoys playing basketball and golf, travelling, and participating in various outdoor activities while appreciating the great Southern California weather.

Chad Marquis

CPO Certified Prosthetist Orthotist

Chad is a Certified Prosthetist/Orthotist with over 25 years of experience in the field. He received his Bachelor’s Degree in Sports Medicine from the University of the Pacific. Mr. Marquis continued his post graduate studies in orthotics at Northwestern University Prosthetic Orthotic Center and prosthetics at the California State University Dominguez Hills program. He received his certifications from the American Board for Certification (ABC) in orthotics in 1995 and prosthetics in 1996.

Prior to joining Prosthetic & Orthotic Group, Mr. Marquis was a partner and a clinical manager of an orthotic and prosthetic company in Orange County, California for 17 years. His specialty areas include working with active prosthetic users as well as various orthotic management systems for pediatric and adult rehabilitation. Mr. Marquis also has a subspecialty in animal prosthetics and orthotics, working with many veterinarians in the area. Mr. Marquis uses and implements computer aided design to enhance his O&P practice. He has served on the ABC Orthotic and Prosthetic Education Committee and has participated as a visiting lecturer at both the Chapman University Physical Therapy School and University of California-Irvine Medical School.

Chad is a native Californian originally from Santa Barbara. He and his wife Kimberly reside in South Orange County with their 3 children. Outside of the office, he enjoys spending time with his family, music, sports, yoga and the beach.

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