In a case study involving three asynchronous online professional writing courses, this research investigates students' abilities to establish a social presence and build team cohesion via collaborative, team-based writing projects. Using the Community of Inquiry (COI) framework, this study is situated in the understanding that teaching and learning in higher education are not about the mere transmission of knowledge but that "teaching and learning are inherently interactive" as the terms of "community" and "inquiry" used in the framework suggest. Prior researchers have also established a clear connection between one element of the COI framework--"social presence" and student satisfaction in online courses. Findings from this study indicate participation in collaborative team assignments contributes to team cohesion and positively affects students' ability to establish their social presence within online environments as well as transfer their knowledge to other contexts.