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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 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.  He is Technical Director for the Refrigerated Foods Association and Microbiology Task Force Chair for the American Spice Trade Association.  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 and Colorado State University
  • 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, over 300 invited presentations, and over 100 workshops delivered, his scientific research and outreach interests focus on improving the microbiological quality and safety of foods, with emphasis on meat, poultry, seafoods, and produce.  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, inaugural 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:



When you're dealing with a complex matrix, the real question isn’t “Can it be tested?”—it's “What are you hoping to uncover?” Many things can be tested, but the answers depend on asking the right questions. Learn more about testing complex botanical matrices by clicking the link.


In the world of dietary supplements and botanical materials, accurate identity testing is essential for product safety, regulatory compliance, and consumer confidence. One of the most effective tools in this area is Thin Layer Chromatography (TLC), particularly in its high-performance form (HPTLC). Continue reading to find an overview of HPTLC, compendial HPTLC methods, selecting a fit-for-purpose method, the acceptance criteria, and the advantages and limitations of compendial methods.


Whether you're formulating a botanical powder, validating a nutrient claim, or verifying supplier specifications, reporting on a dry matter basis ensures that decisions are grounded in reliable, standardized data. Click to read a simple explanation of dry matter basis reporting, when it matters, and why.


Fortifying foods and dietary supplements with vitamins, minerals, and bioactives has become a key strategy for innovation and value. Understanding and planning around the LOQ is vital to protecting both your product integrity and your brand credibility. Continue reading to learn how to proactively evaluate your nutrient levels against assay capabilities.


As major retailers implement stricter testing requirements and regulatory expectations, ensuring compliance and quality in dietary supplements is more critical than ever. Join us as we navigate the latest advancements in testing and compliance for dietary supplements, helping brands and suppliers maintain regulatory integrity and consumer trust in a rapidly changing market. Originally Aired on June 11, 2025.


High-value edible oils like olive oil and avocado oil command premium prices for their flavor and health benefits. However, their value also makes them targets for degradation and food fraud. Read our blog about two complimentary testing approaches essential to protecting your customers and brand: quality testing and authenticity testing.


Discover the crucial role of botanical reference materials (BRMs) in supplement quality and regulatory compliance. Learn how BRMs help ensure product integrity and support industry standards.


The Food and Drug Administration (FDA) monitors drug manufacturers' compliance with its current Good Manufacturing Practice (cGMP) regulations in order to ensure the quality of drug products. These regulations are designed to assure products are safe for use and contain the ingredients, strengths, and efficacies of claims made by the product. Learn what tests your OTC products need to be compliant.


As the popularity of the natural mood-enhancing properties of sceletium alkaloids increases, the volume of products containing these compounds will increase, and therefore also the need for robust and selective methods for determining the concentration of alkaloids within these products. Watch our webinar about an innovative HPLC-DAD method for the determination of sceletium alkaloids in powders, capsule fills, and tablets. Originally Aired May 15, 2025


The botanical industry’s unprecedented surge in popularity brings exciting possibilities, but it also invites a serious challenge: adulteration. This blog explains how to identify adulterated botanicals and the role of third-party testing in protecting consumer health and trust.


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