Anders Sandberg, a Swedish researcher and senior fellow at Oxford's Future of Humanity Institute (which closed in 2024).
In the engine he's noted as a theorist of long-term cosmic civilization strategy.
He co-authored the 2017 'Aestivation Hypothesis' (with Stuart Armstrong and Milan Cirkovic), which applies the physics of computation and heat (the Landauer principle) to argue advanced civilizations might wait, dormant, until the universe cools enough to compute more efficiently.
He represents the academic wing thinking rigorously about what super-advanced civilizations might do over cosmic timescales.