1. All patients interested in SRS treatment for tremor must be evaluated by a movement disorder neurologist, Dr. Peter Hedera or Dr. Fenna Phibbs. The neurologist will assess the severity of the tremor. Your primary physician or outside neurologist must make a referral to Dr. Hedera or Dr. Phibbs for initial assessment. For clinical trial participation, a questionnaire will be completed as a baseline measurement (this takes a few minutes). If the patient is an appropriate candidate for SRS and there may be additional evaluations and discussion with the entire Movement Disorder group at monthly meetings.