Welcome! I am an Assistant Professor at the University of Wisconsin-Madison in the Department of Bacteriology. Research in my lab centers on insect-microbe interactions, with a current focus on those between mosquitoes and their gut microbiota. If this topic interests you, get in touch! We are actively recruiting new lab members.

Mailing address:
University of Wisconsin-Madison
Department of Bacteriology
1550 Linden Drive
Madison, WI 53706 USA

Lab phone: +1 (608) 263-6375
Fax: +1 (608) 262-9865


  • Welcome to our newest undergraduate researchers

    Mike LeClaire, Daisy Chew, Journey Prack, and Jake DeWitte will be completing undergraduate research projects under the direction of Andrew Sommer, Aldo Arellano, and Holly Nichols. Welcome!

  • Welcome to Holly Nichols

    We are thrilled to welcome Holly Nichols to the lab! Holly is pursuing her Ph.D. through the Microbiology Doctoral Training Program here at UW-Madison. Holly will be working collaboratively as part of a recently funded …

  • Welcome to Sebastián Díaz

    We are thrilled to welcome Sebastián Díaz as a Visiting Scholar to the lab! Sebastián is currently a Ph.D. student in Frank Avila’s lab at the Universidad de Antioquia in Medellín, Colombia. With support from …

  • WANTED: Postdoctoral Research Associates

    It’s official! We are recruiting two Postdoctoral Research Associates for our 5-year collaborative award from the NSF and BBSRC on mosquito-microbe/microbiome interactions with Eva Heinz and Grant Hughes at the Liverpool School of Tropical Medicine. …


All photos on our homepage are copyrighted by the very talented Jena Johnson. Check out her online portfolio here.