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Depth of Management Knowledge & Clinical Expertise

A collaborative mindset. A commitment to delivering exceptional ENT and allergy care. That is just the start of what sets our Leadership Team apart.

Glenn Noble

CEO | Board Member


Glenn has over 20 years of experience in healthcare finance and operations, mostly in physician practice management. He previously served as Chief Operating Officer of Beacon Oral Specialists, an oral surgery practice management organization with 16 practices in 8 states, over 90 surgeons, and more than 70 locations.

Prior to Beacon, he was Chief Operating Officer of Platinum Dermatology Partners, a dermatology management services organization with over 70 physicians and advanced practice providers, over 500 employees, and serving 34 locations in Texas and Arizona.

Glenn also spent five and a half years as the Executive Director of Operations for Texas Oncology (a member of the US Oncology Network).

In his spare time, Glenn enjoys spending time with his family, traveling with his wife, golfing and cooking. Glenn resides in McKinney, Texas.

Justin Kuperberg

Chief Development Officer


Justin has over 15 years of experience in healthcare mergers and acquisitions and finance for private equity-backed physician practice management groups. He previously served as Chief Development Officer of Spectrum Vision Partners, an ophthalmic practice management organization with 16 practices and 58 locations in 5 states.

Prior to Spectrum Vision Partners, he was Vice President of M&A for Advanced Dermatology & Cosmetic Surgery, a dermatology management services organization with over 160 locations in 16 states. He started his 12-year career at Advanced Dermatology as their Chief Financial Officer.

In his spare time, Justin enjoys spending time at the many Orlando theme parks and traveling with his family. Justin resides in Lake Mary, Florida.

Marcia Siguenza

Chief People Officer

Marcia has over 20 years of experience in healthcare human resources, in physician practice management. She previously served as Chief Human Resources Officer of Pinnacle Dermatology, a dermatology practice with 81 locations in 11 states, over 100 providers, and more than 1200 employees. Prior to Pinnacle Dermatology, she was Chief Human Resources Officer for Clarity Clinic, a provider of psychiatry and therapy services with 5 locations and over 50 providers in the greater Chicagoland area. Marcia also spent 16 years overseeing human resources for Midwest Orthopaedics at Rush, a globally recognized leader in orthopaedic services. In her spare time, Marcia enjoys spending time with her family, going to baseball or softball games, and long weekend trips to the beach. Marcia resides in Wheaton, Illinois.

Neil Hockstein, MD

Board Member

As a board-certified Otolaryngologist- Head and Neck Surgeon at ENT & Allergy of Delaware, Dr. Hockstein cares for patients with diseases of the ears, nose, and throat with particular focus on surgery of the head and neck and the treatment of nasal and sinus disorders.

Dr. Hockstein received his undergraduate degree from Johns Hopkins University and went on to graduate with honors from Jefferson Medical College where he was also elected to the Alpha Omega Alpha Medical Honor Society and the Hobart Amory Hare Medical Society. He then completed residency at the University of Pennsylvania where he served as chief resident. Dr. Hockstein is a previous winner of the residency research prize and the Philadelphia College of Physicians Research Prize. He has published over 35 articles in peer-reviewed medical journals and numerous book chapters and has lectured across the country on the treatment of sinus disease and head and neck cancer.

Will Sheppard, MD

Board Member

Dr. Sheppard is a board-certified Otolaryngologist/ Head and Neck Surgeon at ENT & Allergy of Delaware, and he is a Fellow of the American Academy of Otolaryngic Allergy. He has been practicing in Wilmington, DE since 2002. His practice includes the medical and surgical management of ear, nose, and throat disorders of pediatric and adult patients.

Originally from South Carolina, he graduated magna cum laude from Clemson University in 1993. He then graduated with honors from the Medical University of South Carolina in 1997. While at MUSC, he was awarded membership into the Alpha Omega Alpha medical honor society, served as President of the Honor Council, and was elected class President during his 3rd and 4th years. In 2002, Dr. Sheppard completed his residency at SUNY- Upstate Medical University in Syracuse, New York. There, he was named Surgical Intern of the Year, served as Chief Resident and published research on Meniere’s disease.

Dr. Sheppard provides lectures on a range of ENT topics to practicing physicians, residents, medical students, and the public. He feels fortunate to practice in this medical community and be part of ENT and Allergy of Delaware.

Dr. Sheppard enjoys living in Wilmington with his wife, their three sons, two dogs, some fish, and a reptile.

Kelly McCrann

Board Member

Kelly McCrann has over 35 years of experience leading healthcare companies across a broad range of sectors.

Mr. McCrann serves as a member for several health care entities. He serves on the Board of Directors of EyeCare Partners, from which he retired as Chief Executive Officer in 2021. Prior to creating EyeCare Partners and selling it to Partners Group for $2.2 billion in 2020, Mr. McCrann served as the CEO of AdvoServ (a leader in serving individuals with severe intellectual and developmental disabilities), CEO of Crescent Healthcare (a national specialty home infusion therapy provider), and Senior Vice President of DaVita, responsible for the operating group performing home hemodialysis, peritoneal dialysis, and nocturnal dialysis. Previously, Mr. McCrann served as CEO or Division President of PacifiCare, Coram Healthcare, Xcorporeal, Inc., and Professional Dental Associates. He also served as an Operating Partner with Bessemer Venture Partners. Mr. McCrann began his career with McKinsey & Company.

Mr. McCrann graduated from the University of California, Los Angeles with degrees in Economics and Political Science and earned a Master of Business Administration degree from Harvard University.

Contact Parallel ENT & Allergy Partners Today!