This is a Feasibility/Phase II study for patients with a diagnosis of WHO Grade I - III Meningioma & Hemangiopericytoma brain cancer to be given standard dose Proton radiotherapy. The study will be performed in two phases: first, feasibility with an enrollment of 12 patients and then Phase Page 8 of 20 II, with an enrollment of an additional 38 patients. All patients will also be given quality of life (QOL) instruments pretreatment, weekly during treatment, then q 3 months for year 1 post treatment, q6 months year 2 & 3 and yearly for year 4 & 5. Comparisons will be made between the enrolled subjects receiving proton therapy and the known literature on photon radiation. See section 2 for full objectives. The second phase will begin no earlier than 60 days after the last patient in the initial phase has completed treatment and once safety and feasibility has been verified. The secondary objectives will serve as the objectives for the second phase of the study.