Assistant Professor

Kristian Doyle earned his PhD from Oregon Health & Science University in 2007, developing novel therapeutics for stroke in the laboratory of Mary Stenzel-Poore. He then trained as a Postdoctoral Scholar at Stanford University under the mentorship of Marion Buckwalter, researching the role of TGFbeta signaling after stroke and developing a model of post-stroke dementia. Kristian Doyle started as an Assistant Professor at the University of Arizona in 2013.

Assistant Professor, Neurology

Vivian Nguyen earned her PhD from the University of Southern California, in which she investigated neuroprotective mechanisms of sex steroid hormones against Alzheimer’s disease (AD). She then trained as a Postdoctoral Fellow at the Buck Institute for Age Research and as a Senior Research Scientist at Stanford University, investigating signaling pathways of neurodegeneration. Vivian Nguyen moved to the University of Arizona in 2013. In her spare time, she loves to read and explore nature and historical sites in Arizona with her husband and little girl.

Research Technician

Jen Frye received her Bachelor’s Degree in Ecology and Evolutionary Biology from The University of Arizona. In the Doyle lab, Jen employs her extensive research background to investigate the inflammatory response to stroke in humans as well as different rodent models. In her spare time, Jen enjoys football, wakeboarding, and spending time with her family.

Amanda Chung is currently a Master's student studying Cellular and Molecular Medicine at the University of Arizona. She has been working in the Doyle lab since early 2017. For her Master’s thesis, she studies how myelin debris contributes to the prolonged inflammatory response following stroke. She will be pursuing her medical education at the University of Arizona in 2018. During her spare time, Amanda enjoys all types of physical activities, including yoga, dancing, and biking. Email:

Undergraduate Research Assistant

Megan Hayes is currently studying Neuroscience and Cognitive science as well as Molecular and Cellular Biology at the University of Arizona. She has been working in the Doyle lab since the summer of 2015, assisting in characterizing an aged-mouse model of post-stroke dementia. After earning her Bachelor’s degree, Megan plans to pursue a PhD in neuroscience and a career in research. In her free time, Megan enjoys rock climbing around Tucson. 

Graduate Student, Doyle Lab

Jacob Zbesko went to the University of Redlands where he graduated in 2012 with a BS in Biology. In 2015, he joined the UA ABBS program and is currently a second year graduate student in the Doyle lab investigating immunological responses occurring within brain lesions. When not in the lab, Jacob enjoys playing Ultimate Frisbee and soccer. 


Omar Hussein
Medical Student

Omar Hussein was a Neuroscience major who graduated in 2016 with a Bachelor’s of Science from the University of Arizona. He received the Excellence in Undergraduate Research Award for the Neuroscience and Cognitive Science Summer Research Program in 2015 and is now a medical student at the University of Arizona College of Medicine - Phoenix. While in the Doyle lab Omar performed scanning and transmission electron microscopy of chronic stroke infarcts to determine how well they are compartmentalized from adjacent brain tissue.

Maj Krumberger
Undergraduate Research Assistant

Maj Krumberger was a Bachelor's Degree in Neuroscience and Cognitive Science at the University of Arizona. Maj worked in the Doyle Lab between May 2015 and December 2016 on understanding the mechanisms of the glial scar. He is currently working as an instructional specialist in the Department of Chemistry and Biochemistry and is applying for a Chemical Biology and Chemistry graduate degree. In his free time, Maj is an avid cinephile but also enjoys traveling, especially to places that allow for hiking adventures. 

Justine Mona
Undergraduate Research Assistant

Justine started in the lab in May 2016 and worked to uncover causes of post-stroke dementia. Justine is pursuing a degree in Neuroscience and Cognitive science at the University of Arizona, and is currently studying abroad at the San Hermano Pedro Hospital in Guatemala. Justine will graduate in May 2018 and plans on going to medical school. During her free time Justine likes to run.

Kristina Stepanovic
Undergraduate Research Assistant

Kristina Stepanovic was a UA undergraduate student who worked in the Doyle lab from the summer of 2014 to December 2016.  In the lab she investigated the adaptive immune response to stroke and the effects of a second stroke on the adaptive immune response to stroke. When she graduated she received the Outstanding Senior Award from the College of Science, and the Outstanding Senior Award from the Department of Psychology. Kristina is now a Master’s Student studying clinical psychology at Vanderbilt University. In her free time, Kristina enjoys yoga, Krav Maga, and volunteering at psychological treatment centers.

Alex Urzua
Undergraduate Research Assistant

Alex Urzua was a pre-medical student who graduated in May 2016 with a Bachelor’s of Science in Physiology from the University of Arizona. He is now a medical student at the University of Arizona. After medical school, he hopes to become an orthopedic surgeon. He worked in the Doyle lab as an undergraduate research assistant from January 2015 to August 2016 assisting with characterizing post-stroke dementia in an aged mouse model.