Karl Schroeder is a Canadian science fiction novelist and professional futurist whose career has run parallel to Doctorow's in important ways — same geography (Toronto), same genre, similar period of emergence, and overlapping intellectual concerns with the relationship between technology, political economy, and human flourishing.
Fiction and futurism
Schroeder's novels — including Ventus (2000), Permanence (2002), Lady of Mazes (2005), and the Virga series beginning with Sun of Suns (2006) — are notable for their rigorous treatment of how economic and governance systems interact with technology. Lady of Mazes in particular is a sophisticated examination of how different "manifolds" — communities with different technological and social rules — can coexist within a shared physical space, a question that bears on Doctorow's arguments about competitive-compatibility and adversarial-interoperability at a different level of abstraction.
His futurism work is unusual for emphasizing long-term environmental and civilizational scenarios rather than near-term technology forecasting. He has done foresight work for the Canadian military and various NGOs, and has written extensively about "the economy of meaning" — the idea that attention and meaning, not just material goods, are the contested resources of advanced economies. This connects to the attention economy analysis that tim-wu and Doctorow develop, though Schroeder comes at it from a different angle.
Toronto SF community and early career
Schroeder and Doctorow both emerged from the Toronto science fiction community in the late 1990s and early 2000s — a particularly productive milieu that also included Nalo Hopkinson and others. They co-wrote The Complete Idiot's Guide to Publishing Science Fiction (2000), an early collaboration that reflects the community's ethic of mutual support and knowledge sharing. The Toronto community's approach to SF — politically serious, technically literate, concerned with systemic rather than individual narratives — is visible in both writers' subsequent solo work.
Intellectual relationship
Schroeder and Doctorow share a conviction that science fiction is most valuable when it takes economic and political systems seriously rather than treating them as backdrop. Schroeder's futurism work and Doctorow's activism both operate from the premise that the future is not given — that the trajectory of technology depends on political and economic choices that can be made differently. This voluntarist anti-determinism runs through little-brother, walkaway, and the-lost-cause on Doctorow's side and through Schroeder's manifold and Virga world-building on his.
The friendship between them represents the Toronto SF community's influence on Doctorow's intellectual formation — a reminder that his political ideas developed in conversation with writers who shared his commitment to using fiction to think seriously about the future.