Professor Albert Costa (1970-2018) was one of the most influential scholars in the fields of psycholinguistics and bilingualism. This book provides a faithful look at the most relevant lines of research in which he worked during his academic career. Written by some of his close collaborators and friends, the book presents a coherent summary of the most relevant psycholinguistic theories on language processing and bilingualism, including critical reviews to current models of lexical access, the representation of cognate words, neurolinguistic models of bilingualism, cross-linguistic effects in bimodal bilinguals (sign language), prediction processes and linguistic alignment in bilinguals, the influence of foreign-language effects in social cognition and the effects of bilingualism in emotion and decision making processing. This volume is a tribute to Prof. Costa and his work, and is born from a deep love and respect for his way of approaching the science of multilingualism from a psycholinguistic perspective.