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Physicians //

Dr. Amanda Cook in Sewickley, PA, Dr. Amanda Cook in Beaver, PA

Amanda L. Cook, M.D. | Board Certified Ophthalmologist

General Ophthalmology, Cataract Surgery, Eyelid Surgery, Minor Procedures, Aesthetic Treatments


Dr. Cook graduated from the University of Pittsburgh with a Bachelor of Science degree in Chemical Engineering in 1996. She then decided to attend Penn State University School of Medicine where she graduated in 2001. Her residency was completed at the University of Pittsburgh in 2005. Dr. Cook joined our practice in 2007 and has since broadened her scope of practice to include not only general ophthalmology but lesion removals, upper eyelid blepharoplasty, and aesthetic treatments.


Melissa DeRenzo, M.D. | Board Certified Ophthalmologist

​General ophthalmology, Cataract Surgery, Eyelid Surgery, Minor procedures, Aesthetic Treatments


After practicing in Butler for over 15 years, Dr. Derenzo joined our practice in June of 2020. She completed her residency training at Eye and Ear Institute in Pittsburgh. Dr. DeRenzo is trained and certified to perform comprehensive surgical procedures including no stitch cataract extraction with intraocular lens implant, tumor removal, eyelid surgeries and minor office procedures. She has extensive experience in laser surgery for various ocular diseases including diabetic retinopathy and glaucoma.

Dr. Derenzo was born and raised in Beaver County and is excited to be practicing again in her home community. She currently resides in Gibsonia with her husband and four children.


  • Bachelor of Science, Gannon University

  • Doctor of Medicine, Pennsylvania State University College of Medicine

  • Medical Internship, Mercy Hospital of Pittsburgh

  • Resident in Ophthalmology, Eye and Ear Institute, UPMC

  • Diplomate of the American Board of Ophthalmology


  • American Academy of Ophthalmology

  • Pittsburgh Ophthalmology Society

  • American Society of Cataract and Refractive Surgeons

  • Pennsylvania Academy of Ophthalmology

  • Pennsylvania Medical Society


Erik M. Happ, M.D., F.A.C.S| Board Certified Ophthalmologist

Oculoplastic Surgery, General Ophthalmology


Dr. Mark Schmidt in Sewickley PA, Dr. Mark Schmidt in Beaver PA, optometrist, contact lenses, glasses

Mark E. Schmidt, O.D. | Board Certified Optometrist

Contact lens fittings, Refractive services


Mark E. Schmidt, OD is certified by the American Board of Optometry and is a member of the American Optometric Association as well as the Pennsylvania Optometric Association. He is 1985 graduate of Laroche College and a 1990 graduate of the Pennsylvania College of Optometry. Dr. Schmidt is the only physician in our practice that performs contact lens fittings and with over 20 years of experience, he is very proficient at doing so. He also performs diabetic examinations, cataract evaluations, and treats many different types of anterior segment diseases.

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