Scientific supercomputing was built by two intertwined lineages: the engineers who designed the machines, and the scientists who invented the methods to use them. This genealogy traces both threads — from Vannevar Bush's mechanical integrators to Jensen Huang's GPU revolution, and from Ulam's Monte Carlo dice-throw to AlphaFold's protein predictions. Vertical lines show intellectual succession within each field; dashed diagonals mark cross-domain breakthroughs. Hover any person for their story.