The Innovators

If Lovelace supplies the vision, the middle of the book supplies the correction to how we usually tell invention stories. Isaacson is almost stubborn about it. Again and again he takes a moment we've been taught to attribute to one hero and shows a team, an argument, a borrowing, a handoff. The digital age, he insists, was not conjured by solitary geniuses in flashes of insight. It was assembled by collaborators, over decades, each building on the last.

Take the transistor, the tiny switch at the heart of every modern device. It came out of Bell Labs in 1947, and it is usually filed under the name William Shockley. But Isaacson shows that the actual working device was built by John Bardeen and Walter Brattain, and that Shockley's controlling behavior later helped drive his own best people away. Bell Labs mattered as much as any individual — a place designed so theorists and experimentalists and even telephone-pole engineers ate lunch together, so that ideas could cross the gap between the person who imagined a thing and the person who could make it real.

The dormant ideas of Lovelace and Babbage were finally forced into metal by the pressures of the twentieth century — and above all by war. Isaacson gives real weight to the machines built in the 1940s to compute artillery tables and to break enemy codes. Necessity, funding and urgency did what a century of leisurely theorizing had not: they turned the abstract dream of a programmable machine into humming rooms of vacuum tubes.

At the center stands Alan Turing, the British mathematician who in 1936 had defined, on paper, a universal machine that could in principle compute anything computable. During the war Turing helped crack German codes at Bletchley Park, work that fed the development of code-breaking machines and demonstrated what electronic computation could do under real stakes. His theoretical model and his practical war work bracket the whole transition from idea to instrument.

Step back from the individual episodes and Isaacson's larger argument comes into focus. The computer and the internet were not invented; they were accumulated. His preferred image is a relay race, a baton passed across generations — from Lovelace's notes to Turing's proof to Bell Labs' transistor to the microchip to the personal computer to the network that stitched them together. No single runner wins a relay. The whole point is the handoff.

The internet itself is his cleanest case. It grew out of ARPANET, a project funded by the United States Defense Department in the late 1960s, but Isaacson stresses that its DNA was a peculiar marriage: military money, academic researchers, and a countercultural, hacker-ish ethos that prized openness and shared access. Packet-switching, the idea of chopping messages into pieces that find their own way through a network, was arrived at independently by several people. The web that Tim Berners-Lee built on top of it in 1989 he deliberately gave away, unpatented. Collaboration was not incidental to the network. It was the network's founding principle.

The book ends more or less where it began, back with Ada Lovelace and her insistence that the machine could only ever do what we know how to order it to perform. A century and a half of relay running later, Isaacson lands on the same note: the most fertile ground has always been the collaboration between human and computer, not the contest between them. The great leaps came when someone stood at the seam where the arts meet engineering, where the dreamer and the builder are forced to talk.