Multiple Sclerosis (MS) can be a devastating disease. There is evidence that mesenchymal stem cell treatment is safe and efficacious for the treatment of MS. Patients with MS will receive a single intravenous infusion of cultured allogeneic adult umbilical cord or placental derived mesenchymal stem cells. Patients will be evaluated within one month pre treatment and at 1, 6, 12, 24, 36, and 48 months post treatment for safety and efficacy.