This issue of Clinics in Geriatric Medicine, devoted to Alzheimer's and Other Dementias, is guest edited by Dr. John E. Morley of Saint Louis University School of Medicine. Articles in this important issue include: An Overview of Cognitive Impairment in Geriatrics; Screening for Cognitive Impairment in Geriatrics; Treatable Dementias; Mild Cognitive Impairment in Geriatrics; Alzheimer's Disease; Vascular Dementia; Lewy-Body Dementia; Traumatic Brain Injury in Geriatrics; Diabetes and Dementia; Behavioral Problems and Dementia; Cognitive Stimulation Therapy in Geriatrics; Cognitive Frailty in Geriatrics; and Nutrition and Alzheimer's.