Dr. Mitchell is a Professor of Medicine at Harvard Medical School and senior scientist at the Hinda and Arthur Marcus Institute for Aging Research at Hebrew SeniorLife in Boston. She is a clinical epidemiologist and board certified geriatrician and internist in Canada and the United States. Dr. Mitchell's research interests focus on decision-making, health outcomes, and resource utilization for older people near the end-of-life, particularly those with dementia. She is the principal investigator on several large research projects funded by the National Institutes of Health to study the end-stages of dementia and has been a lead author on many articles in top peer-reviewed journals related to this topic.

Dr. Mitchell is Principal Investigator along with Vince Mor, PhD from Brown University, for the NIA IMPACT Collaboratory: impactcollaboratory.org, which is working to build the nation’s capacity to conduct pragmatic clinical trials of interventions embedded within health care systems for people living with dementia and their care partners. Dr. Mitchell is active in the mentorship of young investigators and is the recipient of a NIH-NIA K24 Mid-Career Investigator Award. She is also a primary care provider for frail nursing home residents at Hebrew Senior Life and attending geriatrician at the Beth Israel Deaconess Medical Center.