Roberta D'Alessandro is Professor of Linguistics / Syntax and Language Variation at Utrecht University. She has recently concluded an ERC project on Microcontact, from which this volume has emerged. She has published on heritage language syntax and syntactic (micro-)variation, impersonal pronouns, and the syntax-phonology interface in journals including Glossa, Theoretical Linguistics, Linguistic Approaches to Bilingualism, and The Annual Review of Linguistics. She is currently Head of the Linguistics section at Utrecht University.