Writing Across Professions (WAP) unites research on writing transfer and work-integrated learning (WIL) to explore how writers adapt and apply knowledge across academic and professional contexts. Drawing on multi-institutional research from the United States, Australia, Germany, and Singapore, the authors introduce Writing Across Professions (WAP), a model designed to prepare students for the diverse writing demands of global workplaces. This book explores the intersection of two key areas of scholarship: writing transfer research and WIL research. The research analyzed in these chapters examines how students develop writing expertise in professional contexts, the barriers they face as writers in the workplace, and the role of writing in shaping pre-professional writing identities. This book equips educators, students, and industry partners with strategies for facilitating writing transfer, fostering professional identity, and navigating the evolving role of artificial intelligence (AI) in writing and effective communication. It is a vital resource for anyone committed to helping students become adaptable and flexible with writing (and communication) in workplace contexts.