Penn Memory Center Physician Researchers

Soumya Bollampally, DO


Dr. Bollampally, of Wall Township, NJ, joined the Penn Memory Center in 2015 as an instructor in the Division of Geriatrics at the Perelman School of Medicine at the University of Pennsylvania. She earned her B.A. in Health and Societies from the University of Pennsylvania, received her medical degree at the Rowan School of Osteopathic Medicine (formerly UMDNJ) and completed her Internal Medicine Residency and Chief Residency year at Pennsylvania Hospital in Philadelphia. Dr. Bollampally completed her Geriatrics Fellowship at the University of Pennsylvania.

Roy H. Hamilton, MD, MS


Dr. Roy H. Hamilton is an Assistant Professor of Neurology at the University of Pennsylvania Perelman School of Medicine. He is board certified in neurology.

He graduated from Harvard University Medical School and the Massachusetts Institute of Technology with degrees in Medicine and Health Sciences Technology. He completed residency in Neurology and a fellowship in Cognitive and Behavioral Neurology, both at the University of Pennsylvania Perelman School of Medicine.

In addition to evaluation and care he provides patients through the Penn Memory Center, Dr. Hamilton is actively engaged in neurology research. The central aim of his research is to define the mechanisms and limits of functional plasticity in the intact and injured adult human brain. As the co-director of the Laboratory for Cognition and Neural Stimulation at Penn, Dr. Hamilton uses a combination of behavioral measures and noninvasive brain stimulation techniques, including transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS), to elucidate structure-function relationships related to normal cognition and to promote therapeutic reorganization of neural representations of cognitive functions in individuals who have suffered from stroke.

Outside of his research, Dr. Hamilton teaches medical students and neurology residents in multiple venues and is the associate director of Penn’s Clinical Neurosciences Training Program. Dr. Hamilton is also deeply involved in issues related to diversity in graduate and medical education, and has spearheaded curricular enrichment initiatives for underrepresented students and trainees at the post-doctoral, graduate, undergraduate, and high school levels.

Sanjeev Vaishnavi, MD, PhD


Sanjeev Vaishnavi, MD, PhD is an assistant professor of Neurology at the University of Pennsylvania, Perelman School of Medicine. He is board certified in Neurology, and has fellowship training in cognitive neurology with an emphasis on Alzheimer’s disease and related diseases.

Dr. Vaishnavi graduated from Georgia Institute of Technology with a B.S. in Applied Biology and then studied medicine (M.D.) and doctoral training (Ph.D. in Neuroscience) at Washington University in St. Louis as part of the Medical Scientist Training Program (MSTP). He then came to the University of Pennsylvania, Perelman School of Medicine to train in Neurology, including a UCNS-certified fellowship in Cognitive and Behavioral Neurology.

Dr. Vaishnavi specializes in the diagnosis and treatment of older adults with cognitive impairment and dementia, including Alzheimer’s and other neurodegenerative conditions, and training medical students, neurology residents, and fellows to be the next generation of leaders. His research has focused on using advanced imaging techniques including functional connectivity MRI and PET to understand learning and aging related changes in the resting human brain, and at the Penn Memory Center, he does clinical research to discover better ways to diagnose and treat neurodegenerative diseases, with an emphasis on early diagnosis and prevention.


Dr. Vaishnavi is accepting new patient appointments through the Penn Memory Center. To schedule an appointment, call 215-662-7810.

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Dawn Mechanic-Hamilton, PhD



Dr. Mechanic-Hamilton earned her Ph.D. in Clinical Psychology with a concentration in Neuropsychology from Drexel University. She completed her internship at Brown University and postdoctoral fellowship in clinical neuropsychology at the University of Pennsylvania. She joined the Penn Memory Center as an Instructor in the Department of Psychiatry in 2012.

Dr. Mechanic-Hamilton’s research has focused on memory systems and functional imaging. Her clinical focus at the Penn Memory Center is on neuropsychological assessment and cognitive and behavioral intervention in patients with cognitive impairment. She is a co-facilitator of the Cognitive Fitness Program.

Neuropsychology Trainees

Kathleen Breslin


Kathy joined the Penn Memory Center in 2015. She is working towards earning her Doctorate in Clinical Psychology at the Philadelphia College of Osteopathic Medicine. She currently holds a Master’s degree from West Chester University of Pennsylvania and is licensed as a professional counselor (LPC). Under the supervision of Dawn Mechanic-Hamilton, Ph.D., Kathy conducts psychometric testing and helps to facilitate the Cognitive Fitness groups.

Megan Glenn

Megan Glenn

Megan is a doctoral student in clinical psychology, specializing in neuropsychology, at Widener University. She currently is completing her predoctoral internship at the Penn Memory Center performing neuropsychological assessments with clinical and research patients and helping to facilitate the Cognitive Fitness Program. Megan originally joined PMC in 2011 as a practicum student and was subsequently employed as a psychometric tester. She received her BA in psychology from the University of Delaware and MS in health psychology from the University of the Sciences in Philadelphia. She has previously completed neuropsychology practicum placements at Temple University Hospital and RSM Psychology Center & Sports Concussion Center of NJ. Megan is involved in research related to episodic memory performance in cognitively normal individuals with biomarkers of Alzheimer’s disease.

Amanda NeMoyer


Amanda NeMoyer is a sixth-year doctoral student in Drexel University’s JD/PhD program in Law and Clinical Psychology. Her research has focused on forensic populations, with particular emphasis on justice-involved youth. In the future, she hopes to utilize knowledge gained from psychological research to inform and advocate for juvenile justice policy change.

Prior to joining the Penn Memory Center as a Neuropsychology Practicum Student, Amanda earned her M.S. in Clinical Psychology from Drexel University. She also earned her B.S. in Journalism with a double major in Psychology at Northwestern University and her J.D. from Drexel University’s Thomas R. Kline School of Law.

Kathryn Devlin


Kate is a doctoral student at Temple University, where she is studying clinical psychology with a specialization in neuroscience. She is a practicum student at the Penn Memory Center for the 2015-2016 year, working with Dr. Dawn Mechanic-Hamilton to conduct neuropsychological evaluations and assist with the Cognitive Fitness program. Her research interests include the effects of cardiovascular and immune dysfunction on cognitive aging, as well as the influence of education and health disparities on risk for dementia. She earned a BS in neuroscience from Brown University in 2009 and a master’s degree in psychology from Temple University in 2014.

Research Nursing

Marianne Watson, RN



Marianne Watson, senior research nurse, has been with the Penn Memory Center since 1993. Marianne conducts screening evaluations and assessments of research participants, handles a wide range of research recruitment, and provides patient and family support. She has extensive clinical experience with the dynamics of the Alzheimer patient and their family.

She manages key aspects of our NACC program including the normal control cohort, our brain donation program, and biological samples collection. She is also involved in various aspects of our diagnostic and investigational drug trial research.

Marianne’s commitment to research extends beyond her professional role at the PMC. She is a long-time participant in the Harvard Nurses Health Study II, the size, duration and scope of which is unmatched in the history of women’s health research.


Felicia Greenfield, MSW, LCSW



Felicia Greenfield earned a master’s in social work from the University of Pennsylvania in 2008 and completed her clinical training from the University of Pennsylvania’s Section of Geriatric Psychiatry in 2011. She has been with the Penn Memory Center since 2006. Felicia’s clinical practice focuses on issues specifically affecting older adults with a particular emphasis on dementia caregivers. She offers individual, family or group therapy. Felicia directs the Penn Memory Center Care Programs, including caregiver education classes, caregiver support groups and the PMC Memory Café. Felicia also serves as a Field Liaison in Penn’s School of Social Policy and Practice.

Affiliated Researchers

Emma Delhaye, MS


Emma is a doctoral student in cognitive neuroscience at the Cyclotron Research Center at the University of Liege in Belgium. She holds a Master’s degree in psychology from the University of Liege. She is currently doing a research stay as a visiting scholar at the University of Pennsylvania to work on a collaborative project with Dr. David Wolk. Her research focuses on episodic memory in normal and pathological aging and underlying neural substrates.

Paul J. Moberg, PhD, ABPP


Dr. Moberg serves as the consulting faculty neuropsychologist for the Penn Memory Center / Alzheimer’s Disease Research Center (ADRC). He is also consulting neuropsychologist at the Parkinson’s Disease Research, Education and Clinical Center (PADRECC) at the Philadelphia Veterans Affairs Medical Center.

Dr. Moberg is an Associate Professor of Neuropsychology in the Departments of Psychiatry, Neurology, and Otorhinolaryngology: Head & Neck Surgery at the University of Pennsylvania School of Medicine. He is the Director of Clinical Services for the Brain-Behavior Laboratory (BBL) in the Neuropsychiatry program and is the Co-Director of the Olfaction and Gustation Laboratory in the BBL.

He earned his Ph.D. in Clinical Psychology/ Neuropsychology from the University of Health Sciences/The Chicago Medical School and completed an internship and postdoctoral fellowship in clinical neuropsychology at the University of Florida. Dr. Moberg is a Fellow of the American Psychological Association (APA), Division 40 (Clinical Neuropsychology) of APA, the Pennsylvania Psychological Association (PPA), and the National Academy of Neuropsychology (NAN). He is board certified in Clinical Neuropsychology by the American Board of Professional Psychology (ABPP).

Click here to learn more about Dr. Moberg’s research

Shana Stites, PsyD, MA, MS


Dr. Shana Stites is a clinical psychologist and quantitative researcher.  She is a Senior Research Investigator within the Penn Project on Precision Medicine for the Brain (P3MB).  In this role, Dr. Stites works with P3MB investigators to lead and conduct studies addressing ethical, legal, and social challenges that arise in the context of precision medicine for neurological and psychiatric diseases. Dr. Stites earned a doctorate in clinical psychology from Chestnut Hill College and MA in Sociology from Lehigh University. She completed her internship at Corporal Michael J. Crescenz VA Medical Center. Her clinical concentration was in neuropsychology with special interests in multicultural competency and applied research.

John Q. Trojanowski, MD, PhD

Dr. John Trojanowski

Dr. John Trojanowski is the William Maul Measey-Truman G. Schnabel, Jr. MD Professor of Geriatric Medicine and Gerontology at the University of Pennsylvania Perelman School of Medicine; Co-Director, Center for Neurodegenerative Disease Research (CNDR); Director, Institute on Aging & Director (IOA); Director, Alzheimer’s Disease Core Center; and Director, Penn Udall Center for Parkinson’s Research

In addition, he co-directs the Marian S. Ware Alzheimer’s Program established in 2004. He is the principal investigator on the Penn Biomarker Core of the NIH/NIA Alzheimer’s Disease Neuroimaging Initiative (ADNI), a landmark study launched by the National Institute on Aging to find methods for monitoring the progression of AD and improving methods of imaging, and the validation of biomarker data. Dr. Trojanowski is responsible for the neuropathology cores in several studies in collaboration with Alzheimer’s Disease Centers across the nation and Parkinson’s disease research projects.

Click here to learn more about Dr. Trojanowski’s research

Dr. Trojanowski’s work is exclusively neuropathology research-related; he does not conduct patient appointments.

Sharon Xie, PhD


Dr. Sharon Xie is an Associate Professor of Biostatistics in the Department of Biostatistics and Epidemiology at the Hospital of the University of Pennsylvania, and Director of the Biostatistics Core of Penn’s Alzheimer’s DIsease Core Center (ADCC).

Click here to learn more about Dr. Xie’s research

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