Swedish philosopher, for two decades at the University of Oxford where he founded and directed the Future of Humanity Institute, and the author of the Simulation Argument.
The other work
He is better known outside this subject for Superintelligence (2014), which put machine-intelligence risk into mainstream policy discussion, and for earlier work on anthropic reasoning and observation selection effects. That background is what makes the simulation paper what it is: it is an exercise in reasoning about self-locating belief under uncertainty, not a metaphysical proposal, and its machinery is the same machinery he uses on extinction risk and on the Doomsday argument.
Why the distinction is worth keeping
The popular version of the argument, that a sufficiently advanced civilisation would run simulations and therefore we are probably in one, drops the two horns that do the philosophical work and keeps the one that makes a headline. Bostrom has said repeatedly that he does not assert the third horn. A reader arriving from The Simulation Hypothesis or from the Jorjani - Danny Jones Podcast 2025 interview should read the paper itself; it is short.
Connections
Simulation Argument · The Simulation Hypothesis · Rizwan Virk · Silurian Hypothesis · Jorjani - Danny Jones Podcast 2025