Patsy M. Lightbown is Distinguished Professor Emerita of Applied Linguistics at Concordia University in Montreal. Her research follows how instruction and feedback shape second language acquisition in classrooms where the emphasis is communicative or content-based, work that has helped anchor language teaching in evidence about how learning actually unfolds.
Lightbown began observing ESL classes with Nina Spada in the 1970s, and across four decades the pair co-authored more than thirty studies of instructed second language acquisition. Their joint work probed questions teachers live with daily: when feedback helps, whether attention to form belongs in its own slot or woven into communication, and how far classroom instruction can bend the course of acquisition. Lightbown's own studies of comprehension-based and content-based programmes in Quebec sharpened the field's sense of what meaning-focused teaching does and does not deliver on its own.
With Spada, Lightbown wrote How Languages Are Learned (Oxford University Press), now in its fifth edition (2021) and used in teacher-education courses worldwide. The book turns first and second language acquisition research into something a working teacher can act on, pairing theory with classroom observation rather than issuing prescriptions. An earlier edition won the English-Speaking Union's Duke of Edinburgh Book Prize in applied linguistics.