Memory impairment due to aging and various memory disorders represent a great medical challenge to our society. Since the publication of the fifth volume of this collection, the rapid progress in the research fields of Alzheimers disease (AD) and other types of dementias continues through the intense efforts of research scientists worldwide. This sixth volume contains eight chapters, bringing together a presentation of scientific frontiers in current AD/dementia research. The topics include a discussion on impairments in dementias, memory binding in AD, therapeutic targeting of BACE1 and neprilysin, Tau Immunotherapy, targeting 5-lipoxygenase targets for tauopathy, potential therapeutics for frontotemporal dementia, potential therapeutics for Downs syndrome, and cognitive rehabilitation in multiple sclerosis. Research advances in these areas are presented and discussed in great detail in the chapters. The book will be highly valuable to students and scientists worldwide who are interested in the scientific research and progress in AD and memory disorders.