Dr. Severin continued his post-residency training and specialization at Baylor Medical Center in Houston, Texas, where he completed a post-doctorate, clinical fellowship in the medical and surgical management of glaucoma. Dr. Severin has authored numerous scientific papers in the medical literature and has been an invited lecturer at scientific meetings across America, Europe and Asia. He serves as an Assistant Clinical Professor at the University of California; Berkeley, where he lectures extensively on the diagnosis and management of glaucoma. Dr. Severin also conducts clinical, research at the University, searching for new diagnostic and treatment modalities for glaucoma.

Dr. Severin is the Medical/Surgical Director at the Refractive Surgery Center at the University of California Berkeley and Pacific Laser Eye Center in Danville. Employing the state of the art technology, Dr. Severin has performed thousands of Lasik and PRK procedures helping patients to overcome nearsightedness, farsightedness, astigmatism and presbyopia.

Dr. Severin is a fellow of the American Academy of Ophthalmology and a Diplomate of the American Board of Ophthalmology. He is a member of the American Glaucoma Society, the Spaeth Glaucoma Fellow Society the Association for Research in Vision and Ophthalmology and the California Medical-Association. His hobbies include skiing, soccer, writing , collecting vintage era comic books , and restoring vintage Volkswagen automobiles.