Dr. Koller is skilled in all areas of neurology
                                                                but has a special interest in stroke. He was
                                                                an investigator for the Stroke Prevention in
                                                                Atrial Fibrillation (SPAF) study. He also was an
                                                                investigator for a trial of the "clot buster" tPA in acute stroke
                                                                and has extensive experience using tPA. He currently
                                                                is involved in the WARSS trial (Warfarin Aspirin
                                                                Recurrent Stroke Study). Dr. Koller is a member of
                                                                the American Heart Association Stroke Council
                                                                and Past President of the Minnesota Stroke Association.