Dr. Dennis O'Brien is a Neurologist in Billings 59101, Billings MT and…read more has an experience of 31 years in this field. Dr. Dennis O'Brien practices at Unavail in Billings 59101, Billings MT. He completed Medical School from UNIVERSITY OF ARIZONA / COLLEGE OF EDUCATION in 1994.
Some of the services provided by the doctor are: Epilepsy,Home Sleep Study,Restless Leg Syndrome,Myoclonus and Wada Test etc.read less