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Douglas L. Marshall

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Douglas L. Marshall, PhD, CFS

Douglas L. Marshall, PhD, CFS

Chief Scientific Officer

Dr. Marshall is Chief Scientific Officer with Eurofins Microbiology Laboratories, Inc., a division of the global life sciences company Eurofins Scientific.  He also is co-founder and Director of the Food Safety Institute, LLC, an integrated consulting and analytical services company affiliated with the Eurofins network of companies.  His former positions include the following:

  • Associate Dean and Professor of Public Health, College of Natural and Health Sciences, University of Northern Colorado
  • Adjunct Professor with the Colorado School of Public Health
  • Professor of Food Science, Nutrition, and Health Promotion at Mississippi State University
  • Assistant Professor of Food Science at Louisiana State University
  • Contributing Editor for the peer-reviewed scientific journal Food Microbiology
  • Four consecutive terms on the editorial board of the Journal of Food Protection

He is a frequent volunteer and consultant to trade associations, NIH, WHO, FAO, USDA, and other government agencies and private companies.  His research and expertise has been featured in popular press venues such as Consumer’s Reports, Fine Cooking, USA Today, Fitness, Health, Men’s Health, Chemtech, Nature Science Updates, and ASM Journal Highlights.  He is a frequently invited speaker and a prolific book chapter writer. With over 250 publications and over 180 invited presentations, his scientific research and outreach interests focus on improving the microbiological quality and safety of foods.  Among these was the completion of the 4 volume Handbook of Food Science, Technology, and Engineering, which he Co-Edited.  He has been the recipient of a number of awards for his scholarly efforts including the Mississippi Chemical Corporation Award of Excellence for Outstanding Work, the International Association for Food Protection Educator and Harold Barnum Industry Awards.  He is a Fellow and former member of the Board of Directors of the Institute of Food Technologists, former Chair of the International Food Science Certification Commission, and former member of the Board of Directors of the American Spice Trade Association.  On a personal note, early in his career he served as a deck hand on an Alaskan fishing vessel (well before Deadliest Catch) and prefers to spend his free time lost on a trail in the Colorado Rocky Mountains.

Below are resources from Douglas:



The experts at Eurofins have identified some key considerations for environment sample collection that will help ensure quality results. These quick tips will help you build a solid foundation for detecting facility risks as you conduct your environmental monitoring programs.


This study seeks to establish the detectability of Listeria species in probiotic cultures and estimate the sensitivity of detection.


Pathogen detection in foods and environmental samples is a critical element in a food management system. This study set out to compare the robustness of Loop Mediated Amplification (LAMP) with that of PCR as illustrated by the detection threshold of Listeria and Salmonella spiked into culture broths previously incubated with various spices.


Enumeration provides the most basic required information with methodologies evolving to provide improved accuracy, precision, and turnaround times. Acoustic-assisted hydrodynamic flow cytometry incorporates the advance of using sound waves to align the particles in the fluid stream for counting, reducing the time to result.


As probiotic consumption rates continue to grow, stakeholders are demanding more information about the quantity, quality, and identity of organisms in probiotic products. Increasingly, flow cytometry is being used to address manufacturers’ and consumers’ demands, and has shown promise in rapidly providing precise quantitative and qualitative probiotic information.


For microbiology both quantity and quality matter, and microbiological testing methods are classified as being either quantitative or qualitative. Which category they fall into is based on what type of data is actually collected and reported.
Keywords: Blog Microbiology


Salmonella depends on an effective food safety program supported by robust Salmonella detection methods. Our objective is to explore recovery of Salmonella from a background of probiotic cultures and demonstrate and validate as effective, sensitive method for detecting Salmonella in probiotic cultures to protect public health.


The success of such programs hinges not only on consistent implementation and testing, but also on the effective swabbing of your plant. Below are the top 5 mistakes our experts see plants make when sampling and submitting swabs and sponges for testing.


This series is focused on getting new pet food, pet treat, and pet supplement businesses headed down the right path.


Although many genera of bacteria produce lactic acid as a primary or secondary end-product of fermentation, the term Lactic Acid Bacteria (LAB) is conventionally reserved for genera in the order Lactobacillales. LAB have many applications in food production and spoilage, all of which apply when considering when and how to test for lactic acid bacteria in food.


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