Alpha Omega Alpha; American Heart Association; National Member, Coordinating Committee of Nationwide Stroke Program, 1964; Member, Executive Committee, Council on Cerebrovascular Disease, 1964-74; Member, Council of Cerebrovascular Disease, 1974-Present; Board Member, 1968-70; Member, Advisory Board and Central Committee; Chairman, Council on Cerebrovascular Disease, 1968-70; Fellow, Council on Cerebrovascular Disease, 1968-70; Member, Nomination Committee of Council on Cerebrovascular Disease,1971-75; Fellow, Council on Circulation, 1972-Present; Chairman, Nominating Committee of Council on Cerebrovascular Disease, 1974; Consult, Scientific Sessions Program Committee, 1979; Member, Stroke Council Program Committee, 1979-81; American Heart Association, Texas Affiliate; Member, Board of Directors, 1979-82; 15 Year Meritorious Service Award, 1985; American Board of Psychiatry and Neurology; Assistant Examiner, 1961-84; Member, Special Panel, Residency Review Committee, 1976; Senior Examiner, 1987; President Lyndon B. Johnston's Commission on Heart Disease, Cancer and Stroke; Subcommittee on Stroke, 1964; Council of the Japanese Neurological Society; Honorary Member, 1964-present; Italian Neurological Society; Honorary Member, 1974-present; The Royal Society of Medicine United Kingdom; Member by Invitation, 1990-present; National Institute of Neurological Diseases and Blindness, USPHS; Member, National Advisory Council, 1965-69; Guest Consultant, 1984; Member, Joint Council Subcommittee Cerebrovascular Diseases, NIH, 1965-69; National Institute of Neurological and Communicative Disorders and stroke, USPHS; Member, Special Project Review Committee, 1975-present; Member, Advisory Committee on Cerebrovascular Disease, 1978-presentNational Heart Institute, USPHS; Chairman, Executive Committee, Joint Study Extracranial Arterial Occlusion, 1965-70; Special Consultant to the Director, 1969; Jury for Selection of Albert Lasker Medical Research Awards, Member, 1965-69; American Heart Association, New York Affiliate; Jury for Selection, Irving S. Wright Award for Young Investigators, 1971; Gov. Romney's Advisory Council on Heart Disease, Cancer and Stroke, Member, 1965-70; Regional Medical Program; Professional Advisory Council on Stroke, Michigan Association, Member 1967-69; Wayne State University Advisory Council, Chairman, 1968-72; Advisory Council, Ad Hoc Committee on Stroke, Chairman, 1969; American Heart Association, Michigan Affiliate, Board of Trustees, 1968-69; Medical Research Council, Ottawa, External Referee, 1969-present; National Institute of Health, Bethseda, Maryland, Special Subcommittee on Neurological Disorders Program, Member, 1973-present; Project Review Committee, Member, 1973-present; Special Research Committee on PET Scanning, Member, 1979; National Science Foundation, Research Proposal Review Board, Neurology and Neurobiology Programs, 1973-present; Hospital Executive Committee Appointments, Executive Board, Detroit General Hospital, 1959, 1960, 1965; Vice President, Detroit General Hospital Research Corp., 1967-68; President, Detroit General Hospital Research Corp., 1967-68; Member, Executive Committee of the Medical Staff, The Methodist Hospital, Houston, Texas, 1969-75; Harris County Hospital District, Houston, Member, Medical Board, 1972-75; Veterans Administration Medical Center, Houston, Appointed member of the following committees: Neurobehavioral Research Review Committee, 1972-86; Animal Resources Subcommittee, 1979-86; Institutional Review Board for Human Investigation, 1982-86; Research and Development Committee, 1980-1983; Neurobiology Merit Review Committee, 1988-1991; Veterans Administration Central Office, Washington, D.C., Member, Neurobehavioral Committee, Merit Review Board, 1985-88; Wayne State University School of Medicine, Honorary Alumni; Multiple Sclerosis Society, Michigan Chapter, Citation of Merit; American Heart Association, Michigan Chapter, Citation Award; Keio University School of Medicine, Tokyo, Japan, Citation of Scientific Merit, 1982; National Migraine Foundation, Citation of Merit, 1982; Department of Health, Education and Welfare, National Advisory Heart and Lung Council, Special Consultant, Cardiovascular and Pulmonary Study Section, 1973; General Medicine B Study Section, Division of Research Grants, 1973; The National Foundation March of Dimes, Houston Chapter, Member, Board of Directors, 1972-73; Medical Advisory Board, 1972-78; Vice Chairman, 1975; International Scientific Advisory Boards, Salzburg Conference on Cerebral Vascular Disease, 1968-present; International Symposium on Cerebral Circulation and Metabolism, 1972-1980; World Federation of Neurology, Secretary, Research Group on Cerebral Vascular Disease, 1977-present; Re-elected Secretary, Research Group on Cerebral Vascular Disease, May 9, 1995; Italian Society of Neurology, Corresponding Member for USA, 1974-present; American Academy of Neurology, Fellow, 1958-present; Member, Advisory Committee, Joint Committee for Stroke Resources, 1975-1980; Member, Ad Hoc Committee on Imaging, 1975-present; American College of Angiology, Fellow, 1973-present; Myasthenia Gravis Foundation, Houston Chapter, Member, Medical Advisory Board, 1975-77; Eisenhower Institute for Stroke Research, Member, Board of Directors, 1975-82; American Association for the Study of Headache, Co-Recipient of the 12th Annual Harold G. Wolff Award, 1977; Co-Recipient of the 13th Annual Harold G. Wolff Award, 1978; Co-Recipient of the 14th Annual Harold G. Wolff Award, 1979; Member, 1978-present, Publications Committee, 1979-present; Stroke Group of Texas, Member, Medical Advisory Board, 1985-present; Houston Area Parkinsonism Society, Member, Board of Directors, 1977-84; Harris County Parkinson's Foundation, Chairman, Medical Advisory Board, 1978-present; National Institute of Neurological Communicative Diseases and Stroke, Member, Advisory Committee on Cerebrovascular Disease, 1977-present; National Science Foundation, Washington, D.C., Scientific Reviewer, 1978-present; Baylor College of Medicine, Distinguished Service Awards, 1980, 1985, 1990, 1995; U.S. Veterans Administration
Merit Review Research Grant Award, 1977-present; National Migraine Foundation, Research Grant Award, 1982-present; Houston Women's Fund, Research Grant Award, 1982-84; Research Grant Award, 1995-96; Harry K. and Albert K. Smith, Research Grant Award, 1984-87; American Medical Association, AMA Drug Evaluations 6th Edition, Consultant, 1985; Mihara Award for Basic and Clinical Research in Cerebrovascular Disorders, 1988; Red Oak Award for the Neurosciences, 1993; Diamond Headache Clinic, Research and Educational Foundation, Member, Advisory Committee, 1991-Present; National Headache Foundation, Member, Therapeutic Advisory Committee, 1991-Present; Seoul National University and Hospital, Department of Neurology, Visiting Professor, October 5-29, 1991; Bertha Memorial Lecture Award, 16th Salzburg Conference on Cerebrovascular Disease,
Washington, D.C. - September 8, 1992; Who's Who Among Outstanding Americans - 1994; Who's Who in Science and Engineering; Who's Who, International of Professionals; Pine Haven Alzheimer's Community, Chairman Medical Advisory Board, 1996-Present, Morris Architects, P.O. Box 22715, Houston, Texas 77227-2715; The Southwest Community Adult Daycare Center, Advisory Board, 1997-Present, St. Luke's United Methodist Church, 3471 Westheimer - P.O. Box 22013, Houston, Texas 77227-2013.