Massachusetts General Hospital, in collaboration with the National Institute on Aging (NIA), is recruiting volunteers for a study examining the effectiveness of a smartphone-based therapy using mindfulness and guided imagery tools to reduce stress, promote the understanding of self and others, and increase feelings of connection for family caregivers of people with dementia. Participants will be randomly assigned to use a smartphone app to receive the guided imagery program or a caregiver skills training for two months. At the start and end of the study and six months later, participants will complete questionnaires about their stress levels, care burden, sleep, and mood.