About Us
Prothotic Laboratories, Inc., established in 1988, is a modern, progressive facility committed to providing the highest quality products, services and patient care. Headquartered in Farmingdale, Long Island with a satellite office in Queens we serve the highly diverse population of the five New York City boroughs and Long Island, including Farmingdale, South Farmingdale, and Bethpage, NY.
Charles Quigg, CEO and his team of highly specialized prosthetists have a long history in the fields of scoliosis management and onsite prosthetics. Their dedication and resolve to build a reputable organization has brought recognition from many healthcare professionals within Long Island and the metropolitan area.
At Prothotic Laboratory, we ensure that all of our patients’ needs are met. Unlike many O&P companies who send out their casts for fabrication to third party facilites, we produce our equipment on site. We ensure that only the highest quality materials, components and standards are utilized when fabricating all of our equipment.
Our staff of A.B.C. and B.O.C. Certified prosthetists evaluate, fabricate and fit a full range of custom Prosthetic and Orthotic devices. We are here for our patients before, during and after the creation of a prosthetic or orthotic device. In short, we become “rehabilitation partners” with our patients, working to give each individual a new beginning.
Through science, technology, and clinical skill, experience, and true caring, Prothotic Laboratories continues to help patients discover a new-found freedom, independence and most importantly, self esteem.
“QUALITY WITHOUT COMPROMISE”
Prothotic Laboratory, Inc’s charter starts with quality, taking to heart the needs of our patient first. We have built our reputation on being the very best in the industry.
“A CONTINUING TRACK RECORD”
That reputation continues today, and will carry on far into the future. Our patients know that excellence is in the very foundation of our business. If you aren’t getting the highest level of pediatric orthotics or prosthetics to meet your needs, contact us using the form on the Contact Us page.
Meet Our Team
Founder, President, CEO
Charles Quigg is the founder of Prothotic Laboratory Inc., a full-service prosthetic and orthotic facility based in Farmingdale, New York. With over five decades of experience in the field, Charles has dedicated his career to improving mobility and enhancing quality of life for individuals with physical challenges.
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Since entering the profession, he has developed extensive expertise in the evaluation, design, and fabrication of custom orthotic and prosthetic devices. His clinical approach emphasizes individualized care, functional outcomes, and close collaboration with physicians, therapists, and families.
Charles has a particular interest in pediatric orthotics, scoliosis management, and complex lower extremity conditions. He is committed to integrating advanced technologies into clinical practice—including 3D scanning, digital design, and additive manufacturing (3D printing)—to enhance precision, efficiency, and patient outcomes.
Through Prothotic Laboratory Inc., Charles continues to lead with a focus on innovation, craftsmanship, and compassionate care, ensuring that each patient receives the highest level personalized treatment.
Director of Operations
Linda Quigg is the Vice President of Operations at Prothotic Laboratories, where she has worked for 30 years overseeing all aspects of the business. She holds a Master’s degree in Industrial-Organizational Psychology from Hofstra University and is deeply committed to ensuring patient-centered care for every family served.
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Linda is also a strong advocate for patients and families in need of services, often extending her support beyond the workplace.
Outside of work, she enjoys cooking, interior decorating, and spending time with close friends and family.
Clinicians
Mark Greenstein C.O.
Director of Clinical Services
I am an ABC Certified Orthotist and Director of Clinical Services with over 25 years of experience in the orthotics field. I began my career in 1999 as an orthotic technician, where I quickly discovered a passion for creating devices that could improve the lives of others. Seeing the direct impact that orthotic care had on patients inspired me to pursue certification and advance my career as an Orthotist.
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My early experience as a technician provided a strong foundation and a unique perspective in the field. It allowed me to develop a deep understanding of how orthotic devices are designed and fabricated, helping me become a well-rounded practitioner capable of creating braces tailored to each patient’s specific needs.
Since joining Prothotic Laboratories in 2019, I have had the opportunity to focus on providing high-quality orthotic care while also helping guide our clinical team. Today, as a Certified Orthotist specializing in pediatric orthotics, lower extremity orthotics, and scoliosis management, I am motivated by the opportunity to work closely with patients every day and help them improve their mobility, independence, and overall quality of life. I earned my Associate’s Degree in Entrepreneurship and Bachelor’s Degree in Marketing from Johnson & Wales University, followed by my Advanced Specialty Diploma in Orthotics from Century College. I see patients at our Farmingdale and Queens offices, as well as at various clinic locations.
When I’m not working, I enjoy living on Long Island and being part of the community I serve. In my free time, I enjoy traveling, classic cars, and spending time with family and friends.
Dave Zwicker C.O.
I am an ABC Certified Orthotist with more than 53 years of experience in the orthotics and prosthetics field. Over the course of my career, I’ve had the opportunity to work in a variety of settings, including serving as team orthotist for the New York Islanders, but what has always remained constant is my commitment to helping people move better and live more independently.
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Since joining Prothotic Laboratories over 21 years ago, I’ve been able to focus on one of my greatest passions: helping children reach their mobility goals. Being part of an innovative team that is dedicated to finding thoughtful, sustainable solutions for our patients has been incredibly rewarding.
I specialize in cranial molding helmets using the Talee system by Invent Medical, guiding families through evaluation, digital scanning, fitting, and follow-up care. I am also proud to provide ankle-foot orthoses (AFOs), and a variety of custom upper and lower extremity braces. I understand that choosing bracing therapy can feel overwhelming, and my goal is to make the process reassuring, informative, and positive. With decades of experience and a patient-centered approach, I work closely with families to ensure each patient receives a comfortable, well-fitting device designed for optimal results, nothing is more rewarding than watching little ones thrive. I see patients in our Farmingdale and Queens offices, as well as at various clinic locations.
When I’m not in the office, I enjoy spending time with my grandchildren and traveling with my family. After five decades in this field, I can honestly say that helping patients gain independence and achieve their goals never gets old.
Jason Salegna C.O.
I am a BOC Certified Orthotist and have been working with Prothotic Laboratories since 2023. Overall, as of 2026, I have 22 years of experience in O and P. I primarily serve patients in our clinic locations and our referring hospital facilities. One of my main responsibilities is ensuring patients receive the bracing they need, when they need it.
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Whether responding to urgent situations that require immediate intervention or supporting individuals managing long-term, complex conditions, I am committed to delivering timely, reliable care.
It is my belief that every patient; from those with minor conditions or those patients navigating chronic or medically complex conditions; deserves and receives from me empathy, patience, and respect. I take great pride in providing quality, consistent care and compassionate support thereby making sure every patient has a positive experience throughout their treatment journey.
Outside of work, I enjoy spending time with my family.
James Quigg C.O.A.
I am an ABC Certified Orthotist Assistant and spend most of my time working with patients across our various clinic locations, including our Queens and Farmingdale offices. As a clinician, I provide a wide range of upper and lower extremity bracing solutions, with a special interest in 3D printed TLSOs and the innovative possibilities they bring to patient care.
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One of my greatest strengths is my empathy and my ability to create an inclusive, welcoming environment for every patient I work with. I believe that building trust and making patients feel comfortable is just as important as the clinical care itself, and I strive to ensure each individual feels heard, supported, and confident throughout their treatment.
Outside of work, I enjoy traveling, dancing, and exploring new places. One of my most memorable experiences was traveling through Europe, an unforgettable journey that gave me a deeper appreciation for different cultures and perspectives.
Silvana Seidita M.S.O.P.
I am a Board Eligible Orthotist/Prosthetist with a completed education and clinical residency, bringing hands-on training and a strong foundation in orthotic and prosthetic design, fabrication, and patient-centered care. Since joining Prothotic Laboratories, I have been developing my expertise in scoliosis, spinal orthoses, and cranial care, while also providing pediatric bracing including custom upper and lower extremity orthotic and prosthetic devices.
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I earned my degree in Orthotics and Prosthetics from Baylor College of Medicine and completed my clinical residency, which included training in five different states. During this time, I gained experience with diverse patient populations and healthcare teams. This experience broadened my clinical perspective and strengthened my understanding of how different environments, cultures, and clinical approaches can influence patient outcomes. It also reinforced the importance of individualized care, a principle I carry with me in every patient interaction.
As the only female clinician on our team, I bring a perspective that helps patients and families feel supported and confident, while motivating me to continually refine my clinical skills and approach. I strive to create devices that are not only functional and effective but also comfortable and encouraging for children as they reach their mobility goals. I see patients at our Farmingdale and Queens offices, and the various school and clinic locations, where I enjoy collaborating with families to find thoughtful, sustainable solutions for each child’s needs.
Outside of the clinic, I enjoy line dancing, traveling, DIY projects and photography, which allows me to recharge and bring creativity and energy to my work with patients every day.