Dr. Mark D. Hoover is a senior research physical scientist at the National Institute for Occupational Safety and Health in Morgantown, West Virginia. NIOSH is part of the Centers for Disease Control and Prevention. Mark has a BS in Mathematics and English from Carnegie-Mellon University, and MS and PhD degrees in Nuclear Engineering from the University of New Mexico. He is a certified health physicist (CHP) and a certified industrial hygienist (CHP). From 1975 to 2000, he was an aerosol scientist at the Lovelace Respiratory Research Institute in Albuquerque, New Mexico.Mark's career has focused on protecting workers and the public from respiratory disease by establishing a technical basis for anticipating, measuring, modeling, and mitigating toxic aerosols in the workplace and environment. Special concerns have included aerosols of nanomaterials, beryllium, toxic chemicals, fibers, plutonium, and uranium. He has developed improved methods and instrumentation for aerosol characterization and for generation of representative aerosols for industrial hygiene, health physics, drug delivery, bioaerosol, and inhalation toxicology studies. He has served as an aerosol scientist and/or principle investigator for studies on respiratory health and safety and the inhalation hazards of routine operations or accidents involving radioactive, biological, and chemically toxic materials and dispersal of aerosols during operation, waste management, and environmental restoration of chemical, nuclear, and biological facilities. Mark is also an active contributor to the development of national and international standards. He is author or co-author of more than 170 open literature publications, including 10 edited books on space nuclear power systems and one edited book on radioactive air sampling methods. Mark's service activities include: Chair, ANSI N13.8 American National Standard for Radiation Protection in Uranium Mines, member, ANSI Nanotechnology Standards Panel Steering Committee; co-Chair, ANSI N323C, American National Standard for Test and Calibration of Air Monitoring Instruments; Secretary, ANSI N42.33, American National Standard for Radiation Detection Instrumentation for Homeland Security; Member, ANSI N13.61, American National Standard for Sampling Airborne Radioactive Materials in the Environment; Member, ANSI N13.1, American National Standard for Sampling Airborne Radioactive Materials from Stacks and Ducts in Nuclear Facilities; Member, U.S. Delegation to the International Electrotechnical Commission, Scientific Committee 45B, Radiation Protection Instrumentation; Member, U.S. Delegation to the International Standards Organization, Technical Committee 85 (Nuclear Energy), Subcommittee 2 (Radiation Protection), Working Group 14 (Air Monitoring); Technical Contributor, International Commission on Radiological Protection, Internal Dosimetry Committee, Guide for the Practical Application of the ICRP Human Respiratory Tract Model; Member, Peer Review Panel, Toxicity of Militarily Relevant Heavy Metals, Gulf War Illness Research Program, U. S. Army Research and Materiel Command; Member, Exposure Assessment Strategies Committee, American Industrial Hygiene Association; Past Coordinator, DOE Operating Contractors Air Monitoring User Group; Past Member, Biomedical and Environmental Effects Subpanel, Interagency Nuclear Safety Review Panel; Past President, School of Engineering Alumni Association, University of New Mexico; Leader, National Occupational Research Agenda (NORA) Team on Mixed Exposures; Coordinator of the NIOSH Exposure Assessment Tools and Emphasis Program; Frequent presenter of professional enrichment program courses.His professional affiliations include: American Association for Aerosol Research; American Academy of Health Physics; American Academy of Industrial Hygiene; American Conference of Governmental Industrial Hygienists; American Industrial Hygiene Association (Past chairman, Nanotechnology Working Group, Chairman, Control Banding Working Group); American Nuclear Society (Past Chairman, Environmental Sciences Division; Past Chairman, New Mexico Trinity Section); Health Physics Society; International Industrial Hygiene Association; Omicron Delta Kappa; Phi Kappa Phi; Pi Mu Epsilon; Tau Beta Pi.Honors and awards include: Alfred P. Sloan National Scholar, National Defense Fellow; Health Physics Society Fellow Award for Outstanding Contributions to the Profession of Health Physics; a Distinguished Alumnus Award for Extraordinary Professional, Community, and National Accomplishments and Leadership from the School of Engineering, University of New Mexico; Bullard-Sherwood Awards for Research-to-Practice for work on beryllium, for development of the nanoparticle information library, and for outstanding achievement in prevention of flavoring-related bronchiolitis obliterans; inaugural co-recipient (along with George J. Newton) of the Air Monitoring Users Group Mark D. Hoover and George J. Newton Leadership Award for Outstanding Contributions to the Science and Practice of Radioactive Air Monitoring; recognition for his exemplary contributions to emergency response including the Department of Health and Human Services Secretary's Award for Meritorious Service, a Civil Service Special Act Award, the Society of American Military Engineers Cumming Award, a NIOSH Award for CDC/ATSDR Technical Support to the Federal Bureau of Investigation, and a U.S. Environmental Protection Agency Bronze Medal for Dedication, Professionalism, and Outstanding Health and Safety Contributions; awards for outstanding presentations and publications include the David L. Swift Memorial Award; and exemplary leadership and outstanding individual contributor awards from the American Industrial Hygiene Association. Mark would be happy to discuss aerosol sampling and worker protection problems and solutions.