Dr. Monahan, a native of Campbell, CA., received his medical degree from the University of Virginia in 1986, and completed his residency in Ophthalmology at Miller Eye Center, University of Tennessee. He went on to complete a Fellowship program in Diseases and Surgery of the Retina and Vitreous at Touro Infirmary in New Orleans, LA, in 1992.

Dr. Monahan is Board Certified in Ophthalmology and since joining Retinal Diagnostic Center in 1992, has been active in the care and treatment of patients with many varied vitreoretinal disorders. He is especially interested in diseases and surgery of the macula, and has been a clinical investigator for Visudyne therapy and Lucentis for macular degeneration. He helped initiate small instrument surgery in Santa Clara County, for macular pucker, macular holes and vitreous floaters.

Dr. Monahan is the past Chairman of the Department of Ophthalmology at Good Samaritan Hospital in San Jose and past Chairman at both Los Gatos Community Hospital, now El Camino Hospital of Los Gatos, and Regional Medical Center of San Jose. He is a member and former Chairman of the Peninsula Eye Society, as well as a member of the American Society of Retinal Specialists, the American Academy of Ophthalmology, the Association for Research in Vision and Ophthalmology (ARVO), the American Medical Association, the California Medical Association and the Santa Clara & Santa Cruz County Medical Associations. He volunteers as a clinical professor for Stanford University, and has started and continues to run, in conjunction with the Regional Diabetic Colaberative, the Diabetic Retinopathy Screening Clinic for indigent patients from Santa Cruz, Monterey and San Benito counties.