I am passionate about helping women, especially older women, understand the possible benefits and harms of mammography screening. In my research, I have studied breast cancer screening rates in women based on their breast cancer risk and health and I have examined outcomes of screening in older women. I developed a decision aid informing women 75 and older on the benefits (e.g., a small reduction in breast cancer mortality, early detection, reassurance) and harms (e.g., overdetection, false alarms, and radiation exposure) of mammography screening to help support their screening decisions. I have also developed a conversation aid for clinicians to use to individualize mammography screening outcomes for older women to support shared decision-making during a vision. Finally, I have studied breast cancer characteristics, treatment, and survival in older women which led me to develop a breast cancer treatment decision aid for women aged 70 and older with Stage I, estrogen receptor-positive, HER2 negative, breast cancer. I have tested my mammography screening decision aid for women aged 75 and older in a large clinician-cluster level randomized controlled trial and found that it increases older women's knowledge of the benefits and harms of mammography screening and reduces overuse of mammography screening.