TEAM

J.P. VAN PIJKEREN, Ph.D.  |  PRINCIPAL INVESTIGATOR

JP is a Professor (with tenure) in the Department of Food Science. He is a trainer in the Food Science, MDTP, and N&M programs, and is Chair of the Food Science Graduate Program. He is also the Director of the Food Research Institute. JP received his Ph.D. degree from the Alimentary Pharmabiotic Center, University College Cork, Ireland. He conducted his postdoctoral studies at the Cork Cancer Research Center (Cork, Ireland) and at Michigan State University. JP lives in Madison, and in his spare time, he likes to ride his bicycle and cook.

+1 (608) 890-2640 | Email | Google Citations | LinkedIn


An image of JeeHwan holding a multichannel pipette.

JEE-HWAN Oh, PH.D. | RESEARCH ASSISTANT PROFESSOR

Jee-Hwan is a Research Assistant Professor in the Food Science department. He works closely with the VPL to develop innovative technologies that will help to understand the mechanism, and improve the function, of health-promoting properties of select lactic acid bacteria strains. He is actively involved in mentoring undergraduate and graduate students in our laboratory. In his spare time, Jee-Hwan likes outdoor activities, and he likes to make traditional Korean Kimchi.

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MARK HEGGEN | GRADUATE RESEARCH ASSOCIATE

Mark received his Bachelors of Science in Agricultural Biochemistry from Iowa State University in 2020. He is a sixth-year graduate student in the Interdepartmental Graduate Program in Nutrition and Metabolism (N&M). As part of the lab, he works on the role of (p)ppGpp on the fitness of Limosilactobacillus reuteri. Outside his academic aspirations, Mark is an avid reader, enjoys running, and brewing beer.

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IN YOUNG CHOI | POSTDOCTORAL RESEARCHER

In Young is a postdoctoral researcher in the VPL. She received her doctoral decree in Food Science and Biotechnology from Kyungpook National University in 2021. Her research focuses on innovative techniques for the genetic engineering of lactic acid bacteria and the delivery of biotherapeutics. In her free time, In Young enjoys Pilates.

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MORGAN SMITH | GRADUATE RESEARCH ASSOCIATE

Morgan is a second-year graduate student in the Interdepartmental Graduate Program in Nutrition and Metabolism (N&M). She received her bachelors of science in Biochemistry from Michigan Technological University in 2022, with minors in Microbiology and Psychology. Morgan researches the effect of dietary sugars on bacterial interspecies competition. When not in the lab, she loves to hike, kickbox, and play D&D.

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HAILEY CHOI | GRADUATE RESEARCH ASSOCIATE

Hailey is a second-year graduate student in the Food Science program. She completed her Master’s degree in Food Science and Technology from Jeonbuk National University 2023, and her Bachelor’s degree in Food Science and Technology from Seoul Women’s University in 2016. Her research revolves around antimicrobials produced by lactic acid bacteria and phages. In her free time, Hailey plays the piano.

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XINGJIAN YANG | RESEARCH INTERN

Xingjian is currently a research intern in the VPL. He received his Bachelor of Science in Microbiology from the University of Wisconsin-Madison in 2025, with a certificate in Data Science. Xingjian’s research interests lie in studying antibiotic resistance, microbial genetics, and physiology. In his spare time, he enjoys visiting forests and collecting insects, fishing, photography, or practicing origami and singing at home.


DAVID DA SILVA BARREIRA | POSTDOCTORAL RESEARCHER

David is a postdoctoral researcher. He received his Ph.D. in Microbiology from the University of Burgundy, France in 2023. David is currently focusing on bacteriophage and host symbiosis in lactic acid bacteria. In his spare time, he likes to play pickleball and go hiking.

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LAB ALUMNI

Sonali Mohapatra—Postdoctoral Researcher | 2022-2025

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Zhu, Tongbo— Research Specialist | 2023-2024

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Gaur, Gautam— Postdoctoral Researcher | 2022-2024

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Wang, Zhiying— Postdoctoral Researcher | 2022-2024

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Zhang, Shenwei (Vivian)— M.S. and Ph.D. in Food Science | 2015-2022

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Alexander, Laura— Ph.D. in Microbiology | 2015-2021

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Khalid, Saima— Laboratory Manager  | 2022-2024

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Astmann, Theresa— Research Specialist | 2020-2022

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Özçam, Mustafa— Ph.D. in Microbiology | 2015-2018

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Sutedjo, Kenneth—Food Science Undergraduate | 2024-2025

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Qiu, Ling—Food Science and Microbiology Undergraduate | 2018-2019

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Ruiz Ramirez, Silvette—Industrial Microbiology Undergraduate | Summer 2018

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Gierczic, Ben—Food Science Undergraduate | 2018

Cavadini, Chris—Microbiology  Undergraduate | 2017-2018

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Wang, Yixuan (Daphne)—Nutritional Science Undergraduate | Summer 2017

Lacrosse, Jordan—Food Science Undergraduate | 2016-2017

Pan, Meichen (Echo)—Food Science Undergraduate | 2016-2017

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Barham, Caroline—Food Science Undergraduate | 2016-2017

Lawrence, Abigail—Food Science Undergraduate | Spring 2015

Strelow, James—Food Science Undergraduate | Summer 2015

Dorsey, Bridget—Microbiology Undergraduate | 2014-2016

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Maegli, Kathryn—Microbiology Undergraduate | Fall 2015

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Dunphy, Case—Food Science Undergraduate | Spring 2014

Recent Posts

  • Morgan named Deibel Fellow

    Morgan has been named the 2026 recipient of the Robert H. and Carol L. Deibel Distinguished Graduate Fellowship in Probiotic Research! This prestigious FRI fellowship offers a generous stipend and research funds. Congratulations to Morgan!

  • JP named director of FRI!

    We are excited to announce that JP is now the director of the Food Research Institute (FRI)! The FRI is a leader in identifying and resolving food safety issues to meet community, government and industry …

  • VPL at the GRC

    In Young, Jeehwan, Mark, and Morgan were all selected as speakers at the 2025 Gordon Research Conference and Seminar Lactic Acid Bacteria Biology, Symbioses and Applications. A massive thank you to the co-chairs- especially JP- …

  • A probiotic with reduced colonization potential

    Congratulations to Laura, Saima, Theresa, Jee-Hwan, Mark, In Young , and Morgan for their work published in AEM! This paper characterized our lab’s creation of the LR6475 Nonuple strain, a mutant with nine genes encoding …

  • mBio featured image!

    Congratulations to In Young, Jeehwan, and Zhiying for their research published recently in mBio. Their work was selected for the featured image of the edition! “A cartoon of glowing bacteria passing through the gastrointestinal tract. …