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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:



Are ATP swabs adequate enough for monitoring environmental contamination in your facility? Our Chief Scientific Officer, Dr. Doug Marshall explains industry best practices and what might be the best approach. Eurofins publishes our Ask an Expert Series weekly on our social media platforms.


Should you be testing for Listeria species or Listeria monocytogenes? It is difficult question but one that Karissa Roadhouse from our Eurofins Microbiology lab in Louisville, KY helps us understand better in this short video. Eurofins publishes our Ask an Expert Series weekly on our social media platforms.


Eurofins scientists explain the difference between reporting your microbiology testing in colony forming units (CFU) or as Most Probable Number (MPN) per unit of measure. Are they interchangeable? Learn more!


Are you struggling with positive environmental pathogen tests? This may indicate that your facility is suffering from microbial harborage sites. A harborage site is a growth niche in which bacteria or other microorganisms can reside and grow for months and possibly years.


QTA technical experts will work with client to develop infrared testing methods for their high volume and high frequent products. The tests are easy to use by any operators, non-technical personal with minimal training.


In this article get answers to some frequently asked questions about sterol testing. Learn how the method is run, what matrices it is suitable for, and more.


Oil and water don't mix, but they can be made into an emulsion. In this blog read about how emulsions in food products can pose issues for traditional analytical methods and how Eurofins rises to the challenge with specific methodology for these food products.


In this white paper, you'll learn more about the details of Section 402(a)(1) of the Food Drug and Cosmetic Act that defines adulteration. What is considered contamination? How it can happen. What levels of extraneous material are acceptable? Filth analysis should be part of any HACCP plan that requires examination of raw material.


As Minneola, a hybrid between grapefruit and mandarin, has become more popular it may be susceptible to fraud and/or adulteration. This poster shows the phenolic pattern of this fruit, in relation to other orange, grapefruit and mandarin fruits that may be used to identify its juice or juice concentrate.


Wondering which method is most appropriate for testing crude fat in your samples. Read through the answers to these frequently asked questions for guidance.


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