Tim O'Reilly is the founder of O'Reilly Media, a major publisher of technical books and organizer of technology conferences. He is often credited with helping coin and popularize the term "open source" — or at minimum hosting the strategy session at which the term was adopted — as an alternative to stallman's "free software" framing.
O'Reilly's approach to software freedom is explicitly pragmatic and business-oriented. He argued that the term "free software" confused potential corporate adopters (conflating "free as in freedom" with "free of charge," the distinction Stallman calls libre-vs-gratis) and that "open source" better communicated the practical advantages. This position is what Stallman critiques in why-open-source-misses-the-point and software-freedom-vs-open-source.
O'Reilly also raised the "ASP loophole" — what Stallman later addressed as the saas-loophole — arguing that web services companies could use GPL-licensed software internally without triggering the copyleft requirements, since they never distributed binaries. This observation eventually influenced Stallman's drafting of agpl.
The O'Reilly Open Source Convention (OSCON) became a major venue for open-source advocacy, often featuring speakers aligned with eric-raymond's and bruce-perens's open-source-initiative framing rather than Stallman's. O'Reilly appears in revolution-os-documentary as a voice for the open-source perspective.
Stallman consistently distinguishes his goals from O'Reilly's framing, insisting that the four-freedoms and ethical argument are what matters, not developer convenience or corporate adoption.