Inclusion Criteria:  Isolated left middle cerebral artery (MCA) stroke more than 6 months ago (chronic) Stroke type: Ischemic or hemorrhagic Non-fluent aphasia as determined by the Western Aphasia Battery (Fluency < 5) Right-hand dominant prior to stroke English is first or primary language Ability to follow 3-step commands  Exclusion Criteria:  Prior stroke to the right frontal lobe Current diagnosis of moderate to severe depression Diagnosis of any other psychiatric condition History of other neurologic disorders (e.g., epilepsy, brain tumor) Contraindication to MRI or TMS (metal in the head or any implanted electrical device) Has received intensive speech therapy within the past 6 months (>8 hours per week) Enrolled in another interventional study