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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:



This informative blog post covers the basics of probiotic testing for new brands. Learn about federal regulations, formulation, and testing options, including plate counts and flow cytometry, surrounding the efficacy and safety of probiotic supplements. This article contains valuable information for anyone involved in probiotic manufacturing, formulation, or branding!


In this webinar attendees will learn why choosing the right method means accurate results and accurate label claims, and understand which methods to choose for Howaru strain identification and enumeration tests. Original airdate October 25, 2022.
Keywords: Webinar Probiotics


If you are a manufacturer or sell probiotic supplements, testing for counts of probiotic strains is not always straight forward. Here are five tips you should know when it comes to testing your product and verifying your label claims.


Testing or enumeration Bacillus coagulans in gummies is not as straight forward as it seems. Sometimes product matrices are challenging and require a new custom method. Learn how our testing experts know exactly how to problem solve testing in tough matrices like gummy candies.


If you have been using an established probtioic enumeration method with good results, introducing new probiotic strains into your formulas may mean changes need to be made. Read this case study to learn how Eurofins finds a solution to challenging product with multiple strains from multiple manufacturers.


Is your probiotic supplement formulated with both probiotic bacteria and active compounds? If so, getting accurate enumeration of probiotic strains can be a challenge. Learn how our experts in probiotic testing are skilled in finding solutions to tough probiotic formulations in this case study.


Method validation, method verification and fitness for purpose all seem similar, but each requires a distinct level of evaluation and different considerations. Learn more about their similarities and differences in this article.


Whole-Genome Sequencing aids in tracking foodborne illnesses and drug resistance in food pathogens. Read on to learn how WGS ensures food safety and quality.


Why was the genus Lactobacillus reclassified? Andrzej Benkowski, Technical Leader from Eurofins Microbiology in Madison, WI discusses this topic in this short video. Eurofins publishes our Ask an Expert Series weekly on our social media platforms.


Bacillus consists of a wide range of species from pathogenic types to beneficial bacteria. Bacillus coagulans, specifically, is commonly used in various products due to its survivability of many processing conditions as well as long shelf life needs. So, how would you test for the pathogen, Bacillus cereus, in a product containing Bacillus coagulans? Our Principle Scientist, Megan Brown, discussed more on this topic and what to keep in mind.


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