The practice was established at its current location in 1974. As the oldest and leading ENT practice in Marin County, we have a proven track record of providing exceptional ENT services to our patients, hospital, and the community at large. Founded by one of its original members, Arthur C. Fenn, M.D. (now retired), he was joined by Romeo C. Agbayani, Jr, M.D. in 1998, who developed Marin ENT into its current form.