David A. Rosen, MD, PhD

Principal Investigator
Assistant Professor of Pediatrics

David grew up in Michigan where he attended the University of Michigan and double majored in Biochemistry and Hebrew. After completing his undergraduate work in 2002, David traveled west to St. Louis and enrolled in Washington University’s Medical Scientist Training Program. For his doctoral research, David studied urinary tract infection pathogenesis in the lab of Dr. Scott Hultgren. After completing the MD/PhD program in 2010, he joined the Pediatrics Residency Program at St. Louis Children’s Hospital. David fast-tracked into Pediatric Infectious Diseases Fellowship in 2012 and joined the laboratory of Dr. David Hunstad, developing new murine models of Klebsiella pneumoniae pathogenesis. David is now utilizing these models to learn more about Klebsiella virulence in hopes of developing alternative treatments for this increasingly antibiotic resistant organism. In his spare time, David is often found training or racing his bike. He lives in Frontenac with his wife, Diane, and his two children, Marni and Joshua.


Catherine D. Morffy Smith, PhD

Postdoctoral Fellow

Catherine grew up in Rochester, NY and graduated from Haverford College in 2011 with a major in Biology. Following graduation, she spent three years studying acute myeloid leukemia as a research technician for Dr. Gerald Wertheim at the Children’s Hospital of Philadelphia. In 2014, she moved to Athens, Georgia to begin graduate school at the University of Georgia. Catherine completed her doctoral research in the laboratory of Dr. Julie M. Moore, where she explored the pathogenesis of malaria infection in pregnancy. Following the completion of her PhD, Catherine joined the Rosen lab in 2018. Outside of lab, Catherine enjoys running, camping, and learning to bake new things.

Aubree Dahler, MS

Research Assistant

Aubree grew up in Rock Falls, IL and graduated from Southern Illinois University Edwardsville in 2014 with a major in Biology and dual minor in Chemistry and Psychology. She continued her education at Southern Illinois University Edwardsville by attending their graduate program in Dr. Kohn’s laboratory where she studied morphometric research on small mammal bones. Following the completion of her Master’s Degree in 2016, Aubree worked for the American Red Cross in the infectious disease lab until joining WashU in 2019. She joined the Rosen lab in June 2019. Outside of lab, Aubree enjoys hot yoga, canoeing, cooking, hiking, and photography.

Rachel Wasbotten, MS

Research Technician II

Rachel graduated from the University of Southern California in 2017 with a Bachelor's of Arts in Health and Humanity. She moved to St Louis shortly after graduating as a 2017 corps member with Teach for America. She taught high school Chemistry and Physics for the past two years in the St Louis Public School District. She joined the Rosen Lab in June 2019. She previously researched kidney development in the McMahon Lab at USC's Keck School of Medicine. In her free time she enjoys spending time with her dogs, lifting, and exploring new places.

Jason Yang, BA

Medical Student

Jason grew up in Shanghai, China, and graduated from Washington University in St. Louis in 2018, where he double majored in biology and chemistry. He worked with Dr. Petra Levin and investigated the factors of bacterial size control as an undergraduate student. Jason is currently a first year medical student at Washington University School of Medicine. He joined the Rosen lab in 2018. In his spare time, Jason enjoys playing basketball.

Lien Zhu

Undergraduate Student Assistant

Lien grew up in Coralville, Iowa, and is currently studying Biology at Washington University in St. Louis as a member of the class of 2022. He joined the Rosen lab in 2019. In his spare time, Lien enjoys playing soccer, ultimate, and basketball and likes to eat.

Naomi Ghebremichael

Undergraduate Student Assistant

Naomi grew up in Raleigh, NC and is studying Microbiology at Washington University in St. Louis as a member of the class of 2021. She joined the Rosen Lab in August 2019. In her spare time, Naomi enjoys figure skating, traveling, and trying out new restaurants in St. Louis.

Previous Lab Members

Joy Twentyman, BS

Joy went off to obtain her PhD at the University of Washington in 2019.

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