Our Team
Xuemei Zeng, Ph.D., MPH
Research Scientist and Laboratory Manager
Xuemei Zeng, Ph.D., is a Protein Biochemist specializing in proteomics, molecular and cellular biology, epidemiology, and bioinformatics. She holds a Ph.D. in Molecular, Cellular, and Developmental Biology and an MPH in Epidemiology, both from the University of Pittsburgh. Dr. Zeng’s research focuses on leveraging mass spectrometry for both unbiased and targeted biomarker exploration in neurodegenerative diseases. As the manager of the Karikari lab, Dr. Zeng oversees the operational and personnel management of the laboratory, as well as providing support in grant application processes. Outside the lab, Dr. Zeng enjoys the rhythms of Zumba, the tranquility of nature trails, and the satisfaction of cultivating her own vegetables.
Research Scientist
Anuradha Sehrawat, Ph.D. a molecular biologist with advanced degrees in Toxicological Sciences from Jamia Hamdard University, India. Dr. Sehrawat’s research expertise spans cellular and molecular biology, biochemistry, and toxicology, with a focus on gene therapy for a range of diseases; including diabetes (types 1 and 2), pancreatitis, and cancer. Presently, Dr. Sehrawat’s research is dedicated to developing new innovative bioanalytical methods for blood biomarkers in clinical settings. These methods aim to facilitate the early detection and diagnosis of Alzheimer’s disease, as well as identifying early pathological changes in the brain that may allow for preventive interventions. In her free time, Anu finds joy in practicing yoga, meditating, and reading.
John Grizzanti, Ph.D.
Wasiu Balogun, Ph.D.
Postdoctoral Fellow
Wasiu Balogun graduated from Universiti Sains Malaysia with a PhD in Molecular Pathology. In his research, he focuses on the development and application of neuroinflammatory biomarkers in biological fluids, with the goal of using these biomarkers for the diagnosis and prognosis of Alzheimers disease and related dementias. He is experienced in molecular biology, biochemical assays, and neuroscience. In his leisure time, he loves to play with his kids and read about politics of the world.
Alexandra Izydorczak, Ph.D.
Postdoctoral Fellow
Alexandra Izydorczak earned her PhD in Chemistry, specializing in Analytical Chemistry, from the State University of New York at Buffalo. Her research centered on employing mass spectrometry to analyze bioanalytical specimens, including opioids, peptides, and metabolites extracted from tissue biopsies. Utilizing both targeted and untargeted analytical approaches, she aimed to quantify and identify potential biomarkers. Her passion for discovering biomarkers for Alzheimer’s disease was a significant factor in her choice to join the lab. In her free time, Alex enjoys practicing yoga, exploring culinary creations, and diving into a good book.
Senior Research Associate
Marissa Farinas graduated from The Ohio State University with a BS in Neuroscience, where she tested novel small molecule inhibitors in mouse models of multiple sclerosis. She then received an MS in Biomedical Sciences from the Icahn School of Medicine at Mount Sinai. There, her research focused on uncovering molecular markers of vulnerability and resilience of the hippocampal subfields in Alzheimer’s disease using single-nuclei RNA sequencing. After working for a year in a neuropathology lab studying essential tremor, she is returning to the Alzheimer’s field and is excited to delve into the protein biochemistry of AD biomarkers. In her spare time, Marissa enjoys running long distances, watching hockey, and reading.
Tara Lafferty
Research Principal
Tara Lafferty completed her Masters in Psychological Science at Shippensburg University. Throughout her education, she focused on biochemical models of Chronic Traumatic Encephalopathy (CTE). More specifically, she explored the relationship between phosphorylated tau and behavioral manifestations of CTE. Since working with the Karikari lab, her focus has shifted towards Alzheimer’s and Dementia blood biomarker research. Using the Quanterix Simoa HD-X (fully automated Simoa bead-based immunoassay platform), Tara tests clinical samples for the leading blood-based biomarkers for Alzheimer’s and Dementia.
Michel Nafash
Research Specialist
Michel Nafash received his Bachelor of Science in Biobehavioral Health from The Pennsylvania State University in May 2023. During his undergraduate education, Michel worked as a qualitative research assistant on a project that examined treatment facilitators for comorbid opioid use disorder and intimate partner violence in pregnant and postpartum women. Additionally, Michel engaged in urological research using rodent models, and has extensive experience in pharmacy operations. In the Karikari Laboratory, Michel assists in the identification of plasma protein biomarkers of Alzheimer’s Disease through Single Molecule Array (Simoa) technology. Michel intends to pursue a professional career in pharmacology and drug development.
Research Specialist
Jeremy holds a B.S. in Neuroscience from Johns Hopkins University, where he focused on learning and memory systems through both mouse models and clinical research. His recent work at the Johns Hopkins School of Medicine examined the relationships between olfactory markers, neuropsychological assessments, and brain volumetric differences in patients at various stages of Alzheimer’s Disease and healthy controls. At the Mind/Brain Institute at Johns Hopkins, Jeremy researched the role of neuromodulators in long-term potentiation and long-term depression, utilizing monocular deprivation studies in mice. Fascinated by the systems involved in higher-level cognition, especially when they fail, Jeremy was inspired to explore blood biomarkers for early-stage Alzheimer’s Disease at the Karikari lab.
Research Specialist
Lamia Choity earned a B.S. in Biology from the University of Pittsburgh. At the Aging Institute of UPMC, she tested the efficacy of cancer drugs on various RB-1 deficient cancer cell lines and worked with C. elegans to identify methyltransferases that confer resistance to oxidative stress, a factor contributing to aging. Subsequently, she joined the geriatric unit at UPMC Western Psychiatric Hospital as a Student Behavioral Associate (SBA), where she assisted elderly patients with mental health disorders in their daily activities. Her interest in dementia deepened during this role, leading her to join the Karikari Lab. There, she is currently focused on identifying blood biomarkers specific to Alzheimer’s Disease. In her free time, Lamia enjoys drawing and spending time with cats.
Research Associate
Ally graduated from Pennsylvania State University with a baccalaureate of science and majored in biobehavioral health. In the lab, Ally retrieves and processes blood samples to be tested for the presence of biomarkers that are indictive of Alzheimer’s disease. Ally’s research interests include finding more accessible cost-effective diagnostic methods (i.e., blood-biomarkers) to detect Alzheimer’s disease. Her career goals are to go to graduate school to earn her Doctorate in Dental Medicine (DMD). In her spare time, Ally enjoys going on hikes with friends and family, photography, and reading.
Database Manager
Brandon De Lorme comes to the lab with a background in clinical research, data quality, and database programming. Throughout his career, he has worked in laboratory specimen processing, laboratory billing and data reconciliation, clinical research in oncology, vaccination data exchange, data quality, database auditing, and database design/programming. His career interests include enhancing established workflows through automation, building intuitive graphical user interfaces, and finding programmatic solutions for recurring issues. Outside of work hours, Brandon enjoys cultivating seeds from local trees, hiking, and playing jazz triangle.
Statistician
Akshay is a part-time statistician in the Biofluid Biomarker Laboratory and a rising fifth year in the Statistics & Data Science PhD program at Carnegie Mellon University. He has an undergraduate degree in Mathematics and Economics at The Ohio State University. His PhD thesis topic, advised by Professor Matey Neykov, is on minimax rates for convex constrained mean estimation. He has a few years of experience working in healthcare data, including a fellowship with Novartis involving joint modelling and multistate models for immunotherapy clinical data, as well as optimizing health insurance plans during a data science internship with Highmark Health. He is excited to continue to apply his data science skills in industry following graduation in Spring of 2025, with interests in healthcare, finance, and tech.
Biostatistics Student
Nick Heaton is currently working on his Masters in Biostatistics at the University of Pittsburgh. During his education, he has been focusing on classification models of Alzheimer’s Disease. These models look at different blood biomarkers and their predictive capabilities within the Alzheimer’s Amyloid-Tau-Neurodegeneration framework. Beyond that, Nick has an interest in investigating methods to address sample size constraints in prospective cohort studies specific to Alzheimer’s Disease and related comorbidities. In his free time, Nick likes to travel and explore coffee shops around the city.
Yijun Chen
Graduate Student
Yijun Chen is currently pursuing his PhD in Analytical Chemistry. His research primarily involves developing analytical methods using LC/MS and Simoa assays to detect Alzheimer's Disease (AD) biomarkers in human plasma. He is actively working on developing a new quantification method for plasma Aβ peptides utilizing MALDI-ToF technology. Additionally, Yijun is evaluating the pre-clinical performance of various plasma AD biomarkers. His work also extends to the identification of AD-related proteins through proteomics techniques. These efforts aim to enhance the understanding and detection of AD, potentially leading to earlier diagnosis and improved therapeutic strategies.
Menayit Tamrat Dresse
Graduate Student
Dr. Menayit Tamrat Dresse is currently pursuing a Ph.D. in Epidemiology at the University of Pittsburgh’s School of Public Health. Dr. Dresse earned her medical degree from Addis Ababa University in Ethiopia and her Master’s in Public Health and Health Economics from Umeå University in Sweden. She brings experience in clinical practice, research, and leadership to her work. Her current research focuses on identifying biofluid biomarkers for Alzheimer’s disease and related dementias, as well as exploring their performance across different population-based cohorts. She is also working on developing a roadmap for the application of blood-based Alzheimer’s biomarkers in real-world patient care and clinical practice. In her free time, Dr. Dresse enjoys swimming, traveling, reading, and exploring different cuisines.
Shayna Brodman
Student Worker
Shayna Brodman is a third-year undergraduate student-athlete at Davidson College. She is pursuing a degree in biology with a minor in neuroscience on the pre-health track, while also competing in Division I lacrosse. In the Karikari Laboratory, Shayna uses Quanterix’s Single Molecule Array (Simoa) technology to investigate plasma protein biomarkers of Alzheimer’s Disease (AD), aiming to find a more effective and efficient way to diagnose and predict AD pathology. After graduating, Shayna plans to pursue an MD-PhD in neurology with a specialization in neurodegenerative diseases. Outside the laboratory, she enjoys exercising, hiking, kayaking, and exploring local coffee shops.
Student Worker (Alumnus, 2024)
Kathryn Mi is a second-year undergraduate student at Johns Hopkins University. She is currently pursuing a degree in Molecular and Cellular Biology on the pre-health track, and she looks forward to exploring various topics in medicine and public health through her studies. At the Biofluid Biomarker Laboratory, she assists in blood banking as well as method development and optimization of biomarker assays, with the goal of advancing clinical diagnosis of Alzheimer’s disease and related neurodegenerative disorders. In her free time, she enjoys reading, writing poetry, and listening to classical music.