Our Team

Ulf G. Bronas

Dr. Bronas is a Professor and the Associate Dean for Research at the Berkley School of Nursing. He has dedicated his career to developing sustainable, community-engaged exercise interventions designed to prevent and manage chronic diseases. His interdisciplinary research program is uniquely positioned at the intersection of physiology, behavior, and environment, resulting in a continuous record of federal support totaling over $46 million in external funding as a Principal Investigator (PI) or Co-Investigator (Co-I). Professor Bronas leads a vibrant research portfolio as Principal Investigator. His current NIH funded projects include investigations related to Accelerated Age-related Cognitive Decline, and the Impact of Exercise on Executive Function and Neuroplasticity, and investigations on how daily experiences and physical environments influence long-term lifestyle habits. He also recently completed studies investigating lifestyle change in older adults with kidney disease and in older Latino adults at risk for Alzheimer’s disease. Other recently completed NIH funded studies provided critical insights into how stress reactivity contributes to racial and ethnic disparities in cognitive function. In recognition of Professor Bronas work, he was awarded Distinguished Researcher at the University of Illinois Chicago (UIC). With over 170 publications and an H-index of 30, Dr. Bronas contributes to science and healthcare approaches across disciplines. He is an internationally recognized expert in peripheral vascular disease and cowrote the guidelines for exercise therapy in patients with claudication and has provided insight into symptom science. His work is expanding into the use of artificial intelligence and machine learning approaches in understanding cognitive decline, and to personalize treatments approaches and improve nutritional adherence for patients with cardiovascular-kidney-metabolic syndrome and predict frailty in liver transplant outcomes. Dr. Bronas has provided insight into sex dimorphism in revascularization and limb salvage through hi investigations in the genetic regulation of microvascular function in patient with chronic limb threatening ischemia. Through his commitment to health equity, he continues to develop culturally appropriate physical activity programs for Latino/Latina communities, ensuring that cutting-edge science translates into measurable improvements in community health and cognitive resilience. His expertise in physiological and exercise testing protocols has made him a sought-after collaborator across disciplines. As a Co-Investigator, he has contributed to a wide array of NIH-funded randomized controlled trials, including studies in cardiovascular disease, pregnancy, diabetes, music therapy, and COPD. His leadership extends to the executive level of NIA-funded centers, including serving as Director of the Biobehavioral Intervention Core for the P30 Roybal Center for Healthy Aging and provided senior leadership for the P30 RCMAR Center for Health Equity in Cognitive Aging. Dr. Bronas continues to shift the status quo, identifying the mechanisms—from microvascular environments to geolocation activity spaces—that empower individuals to maintain independence and cognitive health across the lifespan.

 PhD, ATC, FSVM, FAHA 

Dr. Shirazia

Dr. Shirazian obtained his medical degree from Brown University and completed his internal medicine residency and nephrology fellowship at Columbia University Medical Center.  He then spent 7 years at NYU-Winthrop Hospital where he was the fellowship program director and the director of nephrology clinical trials before being recruited back to Columbia. He is a board-certified general internist and nephrologist and is Assistant Professor of Medicine in the Division of Nephrology at Columbia University Medical Center. Dr. Shirazian's clinical interests include home dialysis modalities, treating co-morbid mood disorders in patients with kidney disease, hypertension management, cancer-related kidney disease and preventing recurrent kidney stones.

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Dr. Tintle been a leading Biostatistics/Statistical Genetics researcher and educator. He has developed novel methods for the analysis of genetics data, served as a biostatistician and as a statistical geneticist. In 2018 he was selected as a Fellow of the American Statistical Association. He has co-authored over 125 peer-reviewed publications, served as PI on over 20 major federal grants and mentored over 125 undergraduate research students.  Dr. Tintle is also active in the development of novel curricular materials and pedagogical strategies in undergraduate statistics education.

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Dr. Tintle

Dr. Kitsiou’s research, service, and teaching experiences are in the areas of mobile health informatics (mHealth), telehealth/telemedicine, and evidence synthesis.  Dr. Kitsiou is the founder and director of the mHealth Innovation Lab at UIC, and Associate Editor in two top-ranked health informatics journals, namely the Journal of Medical Internet Research and JMIR mHealth and uHealth.

Research Coordinator

Dr.Kitsiou

Miguel Mendieta is a Research Coordinator at Columbia University Irving Medical Center with more than six years of experience in clinical, behavioral, and public health research. In his current managerial role, he oversees the day-to-day coordination of research studies and works closely with investigators, research staff, and participants to support the successful implementation of clinical research. His experience includes both participant-facing responsibilities, such as recruitment, screening, study visits, and retention, as well as administrative research activities including regulatory compliance, data management, protocol implementation, and study coordination.

Miguel is currently pursuing a Master of Public Health at Columbia University. His research interests include clinical psychology, trauma, cognition, and behavioral health. He is particularly interested in understanding how traumatic experiences, chronic illness, and other significant life events shape psychological well-being and cognitive health across the lifespan. He hopes to pursue a PhD in Clinical Psychology and build a career developing evidence-based interventions that improve mental health and quality of life.

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Miguel Mendieta Caloch

Research Coordinator 

Jessica Lugo

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Ashleigh Ayers

Research Assistant

Ashleigh Ayers is a graduate of Georgetown University’s Master of Science in Biochemistry and Molecular Biology program and earned her Bachelor of Science in Molecular and Cell Biology from the University of California, San Diego, with minors in Chemistry and Health Care–Social Issues. Across her undergraduate, graduate, and postgraduate experiences, she has contributed to basic and translational research investigating molecular and cellular mechanisms underlying neurological and other diseases.

Alongside her research background, Ashleigh has gained clinical experience working directly with patients, strengthening her interest in connecting scientific discovery with patient care. Over the years, she has also developed a particular interest in health disparities and the ways research can help address inequities in healthcare access and outcomes. As a Research Assistant in the Bronas Lab, she is excited to expand her experience in patient-centered clinical research and contribute to research examining physical activity and cognitive health in individuals with chronic kidney disease.

Ashleigh plans to pursue a career in medicine and hopes to bridge her interests in scientific research, patient care, and health disparities throughout her career as a physician. Outside of research and clinical work, she enjoys reading, watching movies, spending time with friends, and exploring new restaurants and places around Washington, D.C.

Research Assistant

Zipporah Robinson

Zipporah Robinson is a graduate from Georgetown University's Biophysics and Physiology Master's program. She has also earned a Bachelor's of Science in Health Science from Spelman College. Over the past several years she has had the opportunity to work across different biomedical and public health research settings at Georgetown, the University of Pennsylvania, the University of Utah, and Morehouse School of Medicine. Originally from Oakland, California, she is deeply passionate about social determinants of health and research that bridges gaps in healthcare access. Those experiences strengthened her laboratory skills, but also confirmed how much she enjoys being part of research environments where people are constantly learning, solving problems, and contributing to work that could eventually improve patient care. As a pre-med scholar, researcher, and advocate, she remains committed to merging academic excellence with community centered impact, working toward a future where equity in healthcare is the standard. 

Lwam Yebio

Research Assistant

Lyla Patel

Research Assistant

Lyla completed her undergraduate degree at Emory University in Neuroscience and Behavioral Biology and recently graduated from Columbia University with her Master's in Public Health. She has worked in the Bronas Lab for 2 years focusing her efforts on the EXEC study and working on several manuscripts and projects. 

She presented her work at the Society of Vascular Medicine Conference in 2025 and published her work on claudication symptoms in peripheral artery disease patients in the Journal of Vascular Nursing

Research Assistant

Muskaan Sachdev

My name is Muskaan, which actually means "smile." I hope that's the easiest part of remembering me! I'm a dental professional from India with a Master of Public Health (MPH) in Epidemiology from Columbia University. My journey has taken me from providing patient care in the clinic to contributing to NIH-funded clinical research aimed at improving health outcomes at the population level. Along the way, I've developed a passion for clinical research, community outreach, and scientific communication, all driven by the shared goal of advancing patient care through evidence-based research.

Outside of work, you'll probably find me dancing, playing badminton, swimming, watching a good sci-fi movie, or planning my next adventure. I love spending time in nature, traveling, meeting people from different backgrounds, and learning about their unique perspectives on life. I'm naturally curious, enthusiastic, and I believe there's always something new to learn from every experience and every person I meet.