Howard Feldman, MD, FRCP

ADCS Director

Howard Feldman, MD, FRCP (C) was appointed Director of the Alzheimer’s Disease Cooperative Study (ADCS) in April 2016. He is a clinical neurologist and Professor of Neurosciences at the University of California, San Diego (UCSD). Dr. Feldman came to the ADCS after serving as the Executive Associate Dean for Research at the University of British Columbia (UBC) as well as the Director of the Alzheimer’s and Related Disorders Clinic at UBC. He continues to hold an appointment as an Affiliate Professor with UBC.

Dr. Feldman has made vital contributions in scientific discoveries and clinical research studies focused on aging, mild cognitive impairment/Alzheimer’s disease (AD), frontotemporal dementia (FTD) and diagnostic/therapeutic trials. He contributed to the discoveries of the progranulin (Nature 2006) and C9ORF72 (Neuron 2011) genetic mutations which cause FTD and FTD with motor neuron disease. He was involved in the development of important novel criteria for Alzheimer’s disease that re-conceptualize the disease and could lead potentially to earlier and more successful interventions (Lancet Neurology 2007, 2011, 2014). Dr. Feldman has led a number of international clinical trials in AD resulting in important original data and informing care across the continuum of the disease.

His career contributions have been profiled in Lancet Neurology in 2007. In 2014 he was named by Thomson Reuters as a ‘highly cited’ neuroscientist and among ‘the world’s most influential scientific minds.’ He has been appointed as Fellow of the Canadian Academy of Health Sciences and the American Academy of Neurology in 2008. He has served as inaugural Fisher Family and Alzheimer Society of British Columbia Endowed Professorship for Research in Alzheimer’s Disease.

From 2009-2011, Dr. Feldman took a leave from his academic appointment at UBC to take on a senior leadership role as therapeutic area head for neuroscience global clinical research at Bristol-Myers Squibb, where his research focused on developing novel pharmaceutical therapies for neurodegenerative and other neurological/psychiatric disorders.

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James B. Brewer, MD, PhD

Imaging Core

Dr. Brewer received his graduate and medical training at Stanford University and his neurology residency training at Johns Hopkins University. He joined the Department of Neurosciences in 2004, in a joint recruitment of the Departments of Neurosciences and Radiology, and is a leading investigator at the interdisciplinary Multimodal Imaging Laboratory.

Dr. Brewer’s primary research interest is human memory. He uses functional and structural magnetic resonance imaging (MRI) to study memory processes in volunteers with healthy memory and in patients with memory impairment, such as cases caused by Alzheimer’s disease (AD). This research focuses on the medial temporal lobe (MTL) of the brain, which shows selective damage early in the course of AD. The overarching aim of the work is to better understand the memory function of distinct MTL substructures and the nature of the interaction between those substructures and other brain regions.

Dr. Brewer was one of the first researchers to show that functional MRI (fMRI) can identify distinct activations within the MTL. He and colleagues were the first to use the technique of event-related fMRI to identify brain activity that is directly related to the process of forming memories.

In addition, Dr. Brewer teaches neurosciences and neurology to graduate students, medical students, and residents. He participates as a lecturer in courses on fMRI and memory, assists in neuroanatomy instruction for medical students, and is an active participant in the Neurosciences Graduate Program. He is Co-Director of the UCSD Neurology Residents’ Clinic at the VA San Diego Healthcare System, where he advises and mentors neurology residents in clinical neurology. He is an attending physician at the UCSD and VA Medical Centers. In addition to his university service, Dr. Brewer is an ad hoc reviewer for several journals, including Neurology, Trends in Neurosciences, and Hippocampus.


Gabriel Léger, MD

Medical Safety Core

Dr. Gabriel Léger completed his training in clinical neurology at the Montreal Neurological Institute of McGill University, where he also performed research in imaging of neurodegenerative diseases. He completed clinical fellowships in Movement Disorders at McGill, and in Cognitive and Behavioral Neurology at Northwestern University, Chicago.

After returning to Montreal, where he was Assistant Professor and Director of the Neurology Residency program at the University of Montreal for 7 years, he moved to the Lou Ruvo Center for Brain Health of the Cleveland Clinic, Las Vegas, in 20011, where he directed their fellowship program in Behavioral Neurology and Neuropsychiatry as well as their FTD and young-onset dementia clinic.

He has participated in numerous clinical trials targeting the diagnosis and treatment of Alzheimer’s disease (AD) and related disorders and has a special interest and expertise in the diagnosis and treatment of atypical and focal dementias, including frontotemporal dementia (FTD or Pick’s disease), Primary Progressive Aphasia, Posterior Cortical Atrophy, and dementias with Lewy bodies.

He joined the Neurosciences faculty at UCSD as an Associate Professor in July 2018. His work continues to involve direct patient care, clinical trials in AD and related disorders, and clinical trial medical safety. Dr. Léger has been the Director of the ADCS Medical Safety Core since January 2021.

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Andrea LaCroix, PhD

Recruitment and Communications

Dr. LaCroix is Professor and Chief of Epidemiology in the Department of Family Medicine and Public Health at the University of California, San Diego.  She is also the Director of the Women’s Health Center of Excellence at UCSD.  She has an extensive research program devoted to studies on factors associated with healthy aging in older women and men.  She has conducted numerous randomized clinical trials and observational studies on the prevention of cancer, fracture, heart disease, and frailty in postmenopausal, as well as large, prospective studies of exceptional aging and maintaining physical and cognitive function into later life.

Prior to joining the faculty of UCSD in October 2013, Dr. LaCroix was Co-Principal Investigator of the Women’s Health Initiative (WHI) Clinical Coordinating Center at the Fred Hutchinson Cancer Research Center in Seattle, Washington.  Her work within the WHI program includes evaluating the longterm effects of hormone therapy and calcium/Vitamin D supplementation on chronic disease outcomes including heart disease, cancer and fracture.  She was also Co-Principal Investigator of the Data Coordinating Center for the Menopausal Symptoms: Finding Lasting Answers for Symptoms and Health (MsFLASH) clinical trials network, an NIA initiative to expedite the testing of new interventions for menopause symptoms.  In addition, she continues work on healthy aging studies as a Senior Scientific Investigator at the Kaiser Permanente Washington Health Research Institute (KPWHRI) in Seattle where she has collaborated on the Adult Changes in Thought (ACT) cohort study investigating risk factors for cognitive health and dementia for over 20 years. Dr. LaCroix also lead an NIA-funded T32 training program entitled, “Improving Healthcare for Aging Women” at KPWHRI for the past 10 years.

Dr. LaCroix received her doctoral degree in epidemiology from the University of North Carolina at Chapel Hill in 1984, and completed a postdoctoral fellowship in cardiovascular disease at The Johns Hopkins University in Baltimore, MD in 1985.  Before coming to Seattle, WA in 1989, Dr. LaCroix was a federal government epidemiologist at the National Center for Health Statistics and then the National Institute on Aging.

She served on the National Advisory Council on Aging for the National Institutes of Health, National Institute on Aging from 2009-2012.  In 2010, she received the McDougall Mentoring award which recognizes and honors faculty members who demonstrate an outstanding investment in their mentees’ professional development and success as independent researchers or clinical scientists. In 2014, Dr. LaCroix was elected as a member of the American Epidemiological Society. She has authored over 380 scientific publications, and was selected as a Thomson Reuters Highly Cited Researcher in 2014.


Robert A. Rissman, PhD


Biomarker Core

Dr. Rissman received his graduate degree in Neuroscience from Drexel University College of Medicine in 2001. He completed postgraduate training at the University of California, Irvine and at The Salk Institute, before joining the UC San Diego-Department of Neurosciences in 2008. Dr. Rissman’s work at UC San Diego is split into several parts that are balanced relatively equally. His lab in the School of Medicine at UC San Diego is focused on biomarker discovery in neurodegenerative disease such as Alzheimer’s Disease (AD) and Parkinson’s Disease (PD) using banked human samples and animal models. In addition, Dr. Rissman’s lab studies the mechanistic pathways that link PD neuropathology (e.g. synuclein) to AD in animal models.

In addition to research at UC San Diego, Dr. Rissman is a Principal Investigator at the Veterans Administration (VA) San Diego and this research is focused on understanding how central corticotropin-releasing factor (CRF) neuromodulatory pathways interplays with peripheral stress signaling and contributes to neuronal vulnerability and AD neuropathology using transgenic mice, in vivo pharmacology, and human postmortem tissues. In addition to basic science translational research, Dr. Rissman is the Director for UC San Diego’s Alzheimer’s Disease Cooperative Study (ADCS) Biomarker Core and Alzheimer’s Disease Research Center (ADRC) Neuropathology Core.


Ronald G. Thomas, PhD


Dr. Thomas is a biostatistician with research interests in the following areas: Clinical Trials Design, Analysis of Longitudinal Clinical Trial Data, Visualization software, Clinical Trials Data Capture Software and Discrete Math Algorithms. With a joint appointment in Neurosciences and Family and Preventive Medicine, he has played a pivotal role at the ADCS by serving as Director of the Biostatistics Core, which provides biostatistical expertise for the design, management, and analysis for ADCS clinical investigation.

Dr. Thomas’s own research in Biostatistics and Bioinformatics encompasses four different methodologic areas: (1) developing methods for conducting power analyses in longitudinal clinical trials, with an emphasis on trials in which the investigators anticipate a large loss to follow-up or have issues of non-ignorable missing data; (2) defining algorithms for the efficient calculation of p-values in multidimensional contingency tables; (3) exploring the application of exact inference algorithms to a variety of problems in bioinformatics; and (4) conducting controlled research in medical informatics, which focuses on issues of validity and cost-effectiveness in the use of electronic data capture technologies in multi-center clinical trials.

Creatively combining biostatistics and basic science, Dr. Thomas has established himself as an intellectual force in the design, analysis, and management of large-scale clinical trials. His exemplary leadership in this area is characterized by productivity in publication record and significant contributions to complex multi-site collaborative research efforts.

Dr. Thomas is a member of both the NIA’s Alzheimer’s Disease Center Review Panel and the NIA’s National Alzheimer’s Coordinating Center Scientific Review Panel. Other important activities, within the UC San Diego School of Medicine, include statistical consultations and instruction to fellows and junior faculty.


Carol Evans

Administrative Core

Carol Evans is the ADCS Director of Administration and Business Operations, and the Chair of the ADCS Data and Sample Sharing Committee. Ms. Evans is a member of the senior management team and is responsible for the daily administrative operations of the ADCS. Ms. Evans provides leadership and direction to all staff and sites and is a key professional responsible for working collaboratively with ADCS Core Directors and other colleagues to anticipate needs, streamline processes, and problem-solve systems to ensure best business processes. Ms. Evans is responsible for internal and external communications between ADCS units, campus departments, and internal and external constituencies including campus leadership, Unit Directors, Project Directors, Steering Committee members, UCSD Health divisions, NIH, NIA and other funding agencies.

Ms. Evans leads efforts to develop policies and procedures to ensure the efficient operation of the ADCS, and provides project management, analytical support and leadership, budget resource management, including oversight of the annual operating budget. She serves as the ADCS representative regarding human resources, and facilities/space planning. Ms. Evans assists in developing new directions for the ADCS, including the unit’s strategy/mission statement, and is responsible for developing and implementing the ADCS’s strategic planning. She is a principal advisor to the ADCS Director, advising and providing analytical support and leadership on a variety of projects of importance to the center.


Jen Mason, MPH

Informatics &
Data Management Core

Jen Mason, M.P.H. earned a Bachelors of Science degree in Biology and Bachelors of Arts degree in Psychology from University North Carolina, Wilmington in 2003 and graduated with Master of Public Health (MPH) degree from San Diego State University in 2012.

Ms. Mason began a career in clinical data management at a full-service CRO managing Phase 1- 4 dermatology studies. In June 2013, she joined the Alzheimer’s Disease Cooperative Study, where in her role, oversees the data management services for both industry-sponsored and investigator-initiated studies. Jen holds a post-graduate certificate in Clinical Research from University of California San Diego and is a Certified Clinical Data Manager (CCDM) with the Society of Clinical Data Management.

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Don Guterwill

Clinical Monitoring Core

As Director of Clinical Monitoring, Mr. Guterwill oversees all ADCS clinical monitoring operations and personnel. He is responsible for the coordination of monitoring activities for all ADCS clinical trials, including start-up, launch, maintenance, and closure. Additional activities and responsibilities include protocol review for potential implementation of risk-based, as well as remote monitoring plans. He also chairs centralized monitoring review teams, and prepares investigator and clinical monitor training materials, including materials used for investigator meetings.

Mr. Guterwill’s clinical research experience spans 30 years in various therapeutic areas within neurosciences, infectious disease, oncology, vaccinology, urology, gastroenterology, and pain management. His experience spans over 22 years of global clinical trial management experience, including the management of more than 30 phase 1-4 clinical trials. He is experienced in both industry and investigator initiated clinical trials, both single-center as well as multi-centered. Mr. Guterwill has been involved in the development of clinical trials standards and processes for clinical trial phases 1-4. He enriches his team of clinical monitors and clinical manager(s) with a broad understanding of clinical trial management, process development, clinical compliance oversight, and extensive management experience regarding study sites and clinical monitoring teams.


Leticia Hu


Leticia Hu is the ADCS Finance Director. She is responsible for the oversight of ADCS financial operations and budget planning. She has built a long and distinguished career within UCSD and has gained extensive experience in financial management and research administration. Leticia was the first recipient of the Executive Vice Chancellor Management Fellowship under the mentorship of the Senior Associate Vice Chancellor Steven Ross, playing key roles in campus-wide initiatives and serving in various Department Business Officer roles within Academic Affairs.

Leticia is a graduate of the University of California, Berkeley, with a degree is Development Studies and a minor in Business Administration. Leticia is trilingual, fluent in Cantonese, Spanish, and English, and is passionate about helping the community. She has volunteered with the Jade Ribbon Campaign to spread awareness about Hepatitis B and liver cancer in the Asian community.  She has also volunteered with the East Bay Sanctuary Covenant, helping the low-income Spanish-Speaking community with translating documents and teaching English as a second language.


Nisha Johal

Clinical Operations Core

Nisha Johal is the Director of Clinical Research Operations at the ADCS and is a member of the senior management team. She is responsible for the leadership and oversight of the Clinical Operations group, which includes quality assurance, regulatory, and project management. Nisha oversees the execution of the ADCS multi-center clinical trial portfolio and works to manage the communications, implementation, prioritization, and organization for all clinical trial activities.

She earned her Bachelors of Science in Biology from UCSD, and a Masters in Science in Clinical Research from AUHS. Nisha comes to ADCS with 9 years of experience in oncology clinical research. She began her career in oncology clinical research in 2012 at USC Norris Cancer Center and went on to join the UCSD Health Sciences Moores Cancer Center (MCC) Clinical Trials office in 2014. At MCC, her work focused on industry, cooperative group, and IIT oncology clinical trials in the immunotherapy and molecular targeted therapy space. As a senior leader for clinical trial operations, she was responsible for process improvement and implementation, including a phase 1 pilot unit, accelerated site study start up timelines, FDA Part 11 compliant electronic signatures, central IRB partnerships, and e-regulatory binders.