People


Are you interested in joining our research group? Check out our research interests and send an email to Aaron about opportunities.

Current group members


Aaron Ragsdale

Aaron Ragsdale, Assistant Professor
I joined the Department of Integrative Biology at UW-Madison in Fall 2021. I am interested in the evolutionary and historical processes that shape molecular and organismal variation (see our research interests in the lab). Prior to Wisconsin, I was a postdoc with both Simon Gravel and Andres Moreno, and was a graduate student with Ryan Gutenkunst at the University of Arizona.

Email: apragsdale@wisc.edu


Gustavo Barroso

Gustavo Barosso, Postdoctoral Researcher
I want to understand how population-level processes interact with molecular-level processes to shape patterns of genetic and phenotypic variation. To this end, I develop probabilistic models based on population genetics theory and apply them to both simulated and empirical datasets from a variety of species. My long-term goal is to build more realistic models of nature.

Email: valadaresbar@wisc.edu


Nathan Anderson

Nathan Anderson, Graduate Student
I am interested in the genomic response to selection. My research focuses on developing Diffusion models for complex selective pressures such as quantitative traits in changing environments, and background selection. Before joining UW-Madison, I received my undergraduate in applied mathematics at Texas A&M University and researched phylogenetic methods under Heath Blackmon.

Email: nathan.wally.anderson@gmail.com


Lloyd Kirk

Lloyd Kirk, Graduate Student
I am a computer enthusiast and an avid learner of statistical and population genetics theory, with particular interests in structural variation and its fitness effects. I’m currently working on methods for computing two-locus statistics from tree sequences. Before joining the lab, I was working in the clinical genetics testing industry. I did my bachelor’s in Plant Sciences and MCD Biology at UC Santa Cruz. In my free time, I enjoy biking, cooking, and nerding out. You can find some of my work (and harebrained ideas) on my github.

Email: lkirk2@wisc.edu


Santiago Medina

Santiago Medina, Joint graduate student with the Andrés Moreno Lab at LANGEBIO-Cinvestav.
I am a computational biologist. I received my bachelor’s in agro-genomic sciences from the National Autonomous University of Mexico (UNAM). I am passionate about evolutionary genetics, and my research centers on understanding how demographic history shapes genetic diversity in Native American populations. I love learning mathematics, mainly probability theory. Outside research, I enjoy meeting with friends, hiking, and practicing Brazilian Jiu-Jitsu.


Nick Collier

Nick Collier, Undergraduate Researcher
I am a senior studying evolutionary biology with interests in genetics, evolution, and computational biology. I am enthusiastic about mathematics and its applications in biology.





Renee Li

Renee Li, Undergraduate Researcher
Renee (Runxuan Li) is a senior studying data science at University Wisconsin-Madison. She is interested in exploring different possibilities and has a wide range of interests. She’s currently exploring patterns of diversity in fruit flies to learn about fine-scale distributions of selective effects.



Past members

Vasudha Khanna, Undergraduate Researcher (Fall 2021-Summer 2023)
Linda Zeng, Undergraduate Researcher (Fall 2021-Spring 2023)
Jake Hamburg, Undergraduate Researcher (Spring 2022)