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ENVIRON is an international technical and scientific consultancy providing state-of-the-art scientific, engineering and strategic risk management services to clients who must address a wide variety of public health and environmental risks. To learn more, go to
Kenny Crump's Home Page
Personal Information
Professional History
Education
Contact Information
Selected Publications
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Personal Information
Date of birth: October 13, 1939
Place of birth: Haynesville, Louisiana
Married to Shirley Edmondson Crump, three children
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Professional History
2001- Present
1987 - 2001
1978 - 1987
1966 - 1980
1974 - 1975

1967 - 1968
1963 - 1966
1961 - 1963
Principal, Environ Corporation
Senior Vice-President, ICF Consulting, Inc.
President, K.S. Crump and Co., Inc., Ruston, Lousiana
Professor of Mathematics and Statistics, Louisiana Tech University
Visiting Scientist, National Institute of Environmental Health Sciences,
Research Triangle Park, NC
Research Associate, Department of Statistics, State University of New York at Buffalo
Instructor of Mathematics, Montana State University
Research Associate, Denver Research Institute
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1968
1963
1961
Education
Ph. D., Mathematics
M. A., Mathematics
B. S., Electrical Engineering
Montana State University
University of Denver
Louisiana Tech University
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Contact Information
Office
ENVIRON
602 East Georgia Avenue
Ruston, Louisiana 71270

(318)251-6985
FAX: (318)255-2040
KCrump@environcorp.com
Home
2220 South Vienna
Ruston, Louisiana 71270

(318)255-7058
KennyCrump@email.com
About ENVIRON
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Research Interests
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My interests are mainly in the areas of biostatistics, health risk assessment and analysis of epidemiological data. I have developed several methodologies for health risk assessment, including the Linearized Multistage Model and the Benchmark methodology. I have participated in risk assessments of a number of substances, including asbestos, benzene, diesel exhaust, manganese, and mercury.
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ENVIRON Website
About ENVIRON Corporation
Selected Publications (Click on reference to see abstract.)
Crump K, Viren J, Silvers A, Clewell H, Gearhart J, Shipp A. 1995. Reanalysis of dose-response data from the Iraqi methylmercury poisoning episode. Risk Analysis 15:523-532.
Crump K. 1996. Risk of benzene-induced leukemia predicted from the Pliofilm cohort. Environ Health Perspect 104(Suppl 6):1437-1441.
Crump K, Clewell H, Andersen M. 1996. Cancer and Non-Cancer Risk Assessment Should be Harmonized. BELLE Newsletter 5:2-4.
Crump K. 1996. The linearized multistage model and the future of quantitative risk assessment. Human Exp Toxicol 15:787-798.
Crump K, Krewski D. 1998. Estimation of the number of studies with positive trends when studies with negative trends are present. Canadian J Stat 26: 643-655.
Crump K, Krewski D, Wang Y. 1997. Estimates of the number of liver carcinogens in bioassays conducted by the National Toxicology Program. Risk Analysis 18, No. 3: 299-308.
Crump K. 1998. On summarizing group exposures: Is an arithmetic mean or a geometric mean more appropriate? Risk Analysis 18, No. 3: 293-297.
Crump KS, Kjellström T, Shipp AM, Silvers A, Stewart A. 1999. Influence of Prenatal Mercury Exposure Upon Scholastic and Psychological Test Performance: Benchmark Analysis of a New Zealand Cohort. Risk Analysis 18: 701-713.
Crump KS, Rousseau P. 1999. Results from Eleven Years of Neurological Health Surveillance at a Manganese Oxide and Salt Producing Plant. NeuroToxicology 20: 273-286.
Gibbs JP, Crump KS, Houck DP, Warren PA, Mosley WS. 1999. Focused Medical Surveillance: A search for subclinical movement disorders among a cohort of U.S. workers exposed to low levels of manganese dust. NeuroToxicology 20: 299-314.
Crump K, Krewski D, Van Landingham C. 1999. Estimates of the Proportion of Chemicals that were Carcinogenic, Anti-Carcinogenic or Either in Bioassays Conducted by the National Toxicology Program: Environmental Health Perspectives 107: 83-88.
Crump KS. 1999. Lung Cancer Mortality and Diesel Exhaust: Reanalysis of a Retrospective Cohort Study of U.S. Railroad Workers. Inhalation Toxicology 11: 1-17.
Crump KS, Van Landingham C, Shamlaye C, Cox C, Davidson PW, Myers GJ, Clarkson TW. 2000. Benchmark concentrations for methylmercury obtained from the Seychelles Child Development Study. Environmental Health Perspectives Environmental Health Perspectives 108:257-263.
Crump, KS. 2000. Manganese Exposures in Toronto During Use of the Gasoline Additive, Methylcyclopentadienyl Manganese Tricarbonyl (MMT). Journal of Exposure Analysis and Environmental Epidemiology 10:227-239.
Download c.v. containing complete list of publications
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Research Interests
Clewell HJ, Crump KS. 2000. Determination of an occupational exposure guideline for manganese using the benchmark method. Risk Analysis (submitted).
Last Update: January 20, 2007
Crump KS. 2001. Evaluating the Evidence for Hormesis: A Statistical Perspective. Critical Reviews in Toxicology 31:669-679; also appears in: Human and Ecological Risk Assessment 7:781-794.
Casey Crump, M.D., Ph.D., Patricio Michaud, M.D., Rafael Téllez, M.D., Carlos Reyes, M.D., Gilberto Gonzalez, M.D., Errol L. Montgomery, Ph.D., Kenny S. Crump, Ph.D., Gabriel Lobo, M.D., Carlos Becerra, M.D., John P. Gibbs, M.D. 2001. Does perchlorate in drinking water affect thryoid function in newborns or school-age children? Journal of Occupational and Environmental Medicine 42:603-612.
Crump KS.  2001.  Critical issues in benchmark calculations from continuous data.  Toxicological Reviews (to appear).
Roberts RA, Crump KS, Lutz WK, Wiegand H-J, Williams GM, Harrison PTC, Purchase IFH.  2001.  Scientific analysis of the proposed uses of the T25 dose descriptor in chemical carcinogen regulation.  Archives of Toxicology 75: 507-512.
Crump C, Crump KS, Hack E Panko J, Liebig E, Mundt KA, Luippold RS, Paustenbach DJ, Proctor DM.  2002.  Dose-Response Assessment of Hexavalent Chromium and Lung Cancer Mortality Risk Analysis 23: 1147-1163.        
Crump K S, Canady R, Manolis, K.  2003.  Meta-Analysis of dioxin cancer dose-response for three occupational cohorts.  Environmental Health Perspectives 111:1-7.
Crump KS.  2003.  Quantitative risk assessment since the Red Book: Where have we come and where should we be going?  Human and Ecological Risk Assessment 9: 1105-1112.
Crump KS.  2003.  The Effect of Random Error in Exposure Measurement upon the Shape of the Exposure Response (submitted)
Crump KS, Clewell HJ.  2004.  Association between blood manganese and performance on motor and memory tests unlikely to be related to air manganese.  Letter to the Editor.  Science 303: 169-171.
Berman DW and Crump KS.  2003.  Technical Support Document For A Protocol To Assess Asbestos-Related Risk.  Prepared for: Office of Solid Waste and Emergency Response, U.S. Environmental Protection Agency, Washington, DC 20460.  Under EPA Review.
Tonacchera M, Pinchera A, Dimida A, Ferrarini E, Agretti P, Vitti P, Santini F, Crump K, Gibbs J.  2004.  Relative Potencies and Additivity of Perchlorate, Thiocyanate, Nitrate and Iodide on the Inhibition of Radioactive Iodide Uptake by the Human Sodium Iodide Symporter.  Thyroid 14: 1012-1018..
Crump KS, Gibbs JP.  2005.  Benchmark calculations for perchlorate from three human cohorts.  Environmental Health Perspectives 113: 1001-1008. 
Crump KS.  2004.  Statistical Analysis of Expanded OSHA Database on Respirator Worker Protection Factors.  Prepared for Occupational Safety and Health Administration (OSHA) under OSHA contract J-9-F-0-0051 Task Order No. 5, TC OSHA TO #33 with ToxaChemica, International, Inc. Gaithersburg, Maryland 20878.
Crump KS, Subramaniam RP, Van Landingham CB.  (2005)  A Numerical Solution to the Non-Homogeneous Two-Stage MVK Model of Cancer.  Risk Analysis, 25, 921-926.
Crump KS.  (2007)  Statistical Issues With Respect to Workplace Protection Factors for Respirators. Journal of Occupational & Environmental Hygiene (to appear)
Subramanium RP, Crump KS, Van Landingham CB, White P, Chen C, Schlosser P.  (2007)  Uncertainties in the CIIT model for formaldehyde-induced carcinogenicity in the rat: a limited sensitivity analysis I.  (submitted to Risk Analysis).