Robert Maronpot toxicologic pathology

Sand Photography

“Photographing sand under the microscope is a hobby I started in late 1999 with samples I collected or received from friends. As a veterinary toxicologic pathologist I have access and working knowledge of microscopy equipment and that, together with experience in photomicroscopy, has provided an opportunity to learn about geology and marine biology in examining different sand samples. My interest as a novice in sand has remained keen and I have basically emulated existing and well established professional and active sand related websites to help share the variability and beauty of microscopic features of sand. Creating is also my way of thanking those who have provided sand samples by featuring their contributions.”

Robert Maronpot Toxicologic Pathologist

Robert R. Maronpot, DVM, MS, MPH, DACVP, DABT, was selected by the Awards Committee as the 2008 Society of Toxicologic Pathology Achievement Award recipient. Dr. Maronpot has significantly influenced the field of toxicologic pathology in many different ways, including as a leader, manager, educator, and author. He is internationally recognized and highly respected for his scientific contributions to toxicologic pathology and the advancement of the Society of Toxicologic Pathology (STP). Dr. Maronpot served as president of STP in 2001 and as editor-in-chief of its journal, Toxicologic Pathology, from 2001 to 2004.
Dr. Maronpot received his doctorate of veterinary medicine in 1965 from Michigan State University, an MS in nutritional pathology from Michigan State University in 1966, and an MPH from Harvard University in 1972. He is a diplomate of the American College of Veterinary Pathologists as well as the American Board of Toxicology and has worked more than forty years in experimental pathology, with an emphasis on animal models of carcinogenesis. He serves on several journal editorial boards.
In addition to more than 300 peer-reviewed publications, he has edited a comprehensive text titled Pathology of the Mouse (1999), coedited a book titled Pathology of Genetically Engineered Mice (2000), and has several years of experience in the application of imaging technologies, especially magnetic resonance imaging (MRI), to toxicologic pathology. In 2007, he retired from the National Institute of Environmental Health Sciences (NIEHS) and the National Toxicology Program (NTP), where he was chief of the Laboratory of Experimental Pathology.
As a leader and manager, he started at the NIEHS as part of a very small, fledgling program of experimental pathology in 1981. During his appointment, his vision of increasing the impact of the pathologist in toxicology through a wider use of scientific tools was so successful that, by the end of his tenure, the program had expanded to fifty people, all dedicated to the elucidation of scientific issues in pathology. The pathologists on the current staff at NIEHS joined the program during his tenure and constitute a remarkable group of scientists.
As an educator, Dr. Maronpot also created the training program at NIEHS, where many toxicologic pathologists have been trained through the years. The program maintains two to three trainees, therefore creating a scholarly learning environment. He was the originator of the NTP Symposium held in conjunction with the STP Symposium that has always been well received and considered an important component of the meeting. Dr. Maronpot also has adjunct faculty appointments at Duke University, North Carolina State University, and the University of North Carolina.
In addition to his leadership role as editor of the Pathology of the Mouse, which is a seminal publication to all toxicologic pathologists, he was instrumental in organizing some of the first panels of pathologists to achieve better standardization of our terminology. Specifically impactful was his leadership in the definition of liver proliferative lesions as well as his role in the nomenclature of lesions of the forestomach. These early efforts set the tone for the achievement of consensus in the field and have been critical to the later achievement of clarity in our communication of risk assessment. Dr. Maronpot also contributed significantly to the use of in vivo imaging, particularly MRI and its use in the study of the development, progression, and regression of proliferative changes in rodents.
Dr. Maronpot continues to advance the profession by working as a consultant and striving to address some of the issues of consistency between pathologists. He is frequently sought out to provide expert advice on numerous national and international committees, working groups, and task forces. He serves as an example to the present and future membership for his scientific achievements and selfless dedication to the profession.


R. R. Maronpot

Consultant in Toxicology and Pathology

Robert Maronpot Curriculum Vitae January 2020

Maronpot Consulting, LLC


Michigan State University, B.S., 1963.
Michigan State University, D.V.M., 1965.
Michigan State University, M.S., 1966.
Harvard University, M.P.H., 1972.


Diplomate, American College of Veterinary Pathologists, 1973
Diplomate, American Board of Toxicology, 1980


Hepatic Pathology
Respiratory System Pathology
Preclinical Safety Assessment

Present Position and Background:

2007 – Present Maronpot Consulting, LLC, 1612 Medfield Road, Raleigh, NC

1992 – 2006 Chief, Laboratory of Experimental Pathology, Environmental Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, NC

1991 – 1992 Chief, Experimental Toxicology Branch, National Toxicology Program
National Institute of Environmental Health Sciences, Research Triangle Park, NC

1990 – 1991 Cancer Genetics & Molecular Pathology, Experimental Carcinogenesis & Branch, National Institute of Environmental Health Sciences, Triangle Park, NC

1989 – 1993 Board of Directors, American Board of Toxicology, Washington, D.C.
University of North Carolina, Chapel Hill, NC

1981 – 1990 Head, Experimental Pathology, Chemical Pathology Branch, National Toxicology Program, National Institute of Environmental Health Sciences,
Research Triangle Park, NC

1978 – 1981 Fellow, Bushy Run Research Center, Carnegie-Mellon University
4400 Fifth Avenue, Pittsburg, PA

1975 – 1978 Head, Pathology Department, Chemical Hygiene Fellowship, Carnegie-Mellon Institute of Research, 4400 Fifth Avenue, Pittsburg, PA

1974 – 1975 Head, Research Animal Facility

1974 – 1975 Acting Head, Experimental Pathology Division, Naylor Dana Institute for Disease, American Health Foundation, Valhalla, New York

1974 – 1975 Clinical Assistant Professor of Pathology, New York Medical College,
Valhalla, NY

1975 Consultant in Veterinary Pathology, Memorial Sloan-Kettering Cancer Research Center, New York, NY

1972 – 1974 Research Fellow in Comparative Pathology, Pathology Department, Harvard Medical School and Angell Memorial Animal Hospital
Boston, MA

1971 – 1972 Research Fellow in Public Health, Microbiology Department, Harvard School of Health, Boston Massachusetts
Valhalla, NY

1968 – 1971 Head, Veterinary Medicine Department, U.S. Naval Medical Research Unit #3,Cairo, Egypt

1966 – 1968 Veterinary Laboratory Officer, Veterinary Corps, U.S. Army Pathology Division, U.S. Army Medical Research and Nutrition Laboratory, Denver, CO

1965 – 1966 NIH Postdoctoral Fellow, Pathology Department, Michigan State University, Lansing, MI

Professional Memberships and Affiliations:

American College of Veterinary Pathologists
Society of Toxicologic Pathologists
Society of Toxicology
International Academy of Toxicologic Pathology

Honors And Awards:

President, International Academy of Toxicologic Pathology, 2011-2012
Vice President, International Academy of Toxicologic Pathology ,2010
Fellow, International Academy of Toxicologic Pathology, 2009
Society of Toxicologic Pathology Achievement Award, 2008
Board of Directors, American Board of Toxicology, 1989-1993
Editor-in-Chief, Toxicologic Pathology, 2001-2004
President, Society of Toxicologic Pathology, 2001-2002
Distinguished Postdoctoral Veterinary Alumnus Award from Michigan State University
College of Veterinary Medicine – 2000
Diplomate, American Board of Toxicology, 1980
Diplomate, American College of Veterinary Pathologists, 1973

Other Activities:

Editorial Review Board:
Senior Advisor – Toxicologic Pathology, 2005-2008
Editorial Board – Experimental & Toxicologic Pathology, 2001-2017
Editor – Toxicologic Pathology, 2001- 2004
Editorial Board – Toxicologic Pathology, 1986-2001
Section Editor, Laboratory Animal Pathology, 1996-2001
Editorial Board – Drug and Chemical Toxicology, 1986-1992
Editorial Board – Fundamental and Applied Toxicology, 1985-1991
Editorial Review Board – Environmental Health Perspectives, 1985-1992; 1994-1997
Editorial Board – Toxicology, 1988-1998
Editorial Board – Toxicology Research and Application – 2019 – present
Editorial Board – Journal of Toxicologic Pathology – 2018-present
English Editor – Foods & Food Ingredients Journal of Japan, 2018- present

Publications And Papers:

Masubuchi, Y., T. Tanaka, R. Okada, Y. Ito, J. Nakahara, S. Kikuchi, Y. Watanabe, T. Yoshida, R. R. Maronpot, M. Koyanagi, S. M. Hayashi and M. Shibutani (2019). “Lack of preventive effect of maternal exposure to alpha-glycosyl isoquercitrin and alpha-lipoic acid on developmental hypothyroidism-induced aberrations of hippocampal neurogenesis in rat offspring.” J Toxicol Pathol 32(3): 165-180.

Ramot, Y., Nyska, A., Markovitz, E., Dekel, A., Klaiman, G., Zada, M.H., Domb, A.J., and Maronpot, R. R. (2015) Long-term local and S