The doctor who ran one of the most destructive experiments in the history of psychiatry saw his patients twice a day and phoned the nurses on weekends and holidays to check on their progress. He genuinely cared. He was also, at the same moment, obliterating those patients' memories, regressing them to incontinence, and leaving some of them permanently damaged — in the sincere belief that he was curing them.
That's Ewen Cameron, and the reason he needs a full portrait rather than a villain's cameo is that he was not a sadist. He was a reformer — a man who wanted to modernize the treatment of mental illness, who opened the first unlocked psychiatric ward in Canada, who advocated for humane care — and who, driven by a desperate faith in his own methods and a fatal blindness to their failure, became one of the great destroyers in his field. Cameron is the book's most disturbing figure precisely because his cruelty grew directly out of his zeal to help. To understand how a healer becomes a wrecker, you have to look at the whole man.
Cameron grew up in Scotland, the son of a stern Presbyterian minister, and he had a fraught relationship with the church and with authority his entire life.1 That detail turns out to be load-bearing. The man who would impose absolute control over his patients' minds spent his own life in rebellion against the absolute authority he'd been raised under — and he channeled that rebellion into a fierce, public rejection of religion.
His restlessness shows in his résumé: between 1925 and 1938 he held five jobs, moving from Scotland to Johns Hopkins to Switzerland to Manitoba to Worcester to Albany.2 Dimsdale poses the open question that résumé raises: was the constant motion a sign of brilliance, dedication, careerism, or personal instability? All four readings fit, and the ambiguity is the point — Cameron was some volatile compound of genuine ability, real ambition, and something less stable underneath.
Everywhere he went, he tried things. He was a gadget-lover, game to attempt almost anything to help his patients — dehydration therapy, heat therapy, red-light exposure, cod liver oil, carbon dioxide inhalation, ketogenic diets. At Worcester he introduced insulin shock therapy, its first use in North America, deliberately inducing comas for hours at a time, repeated for up to fifty days. None of it worked particularly well.3 But notice the pattern already forming: a man who would try anything, who preferred aggressive intervention to patient waiting, and who, when a dangerous treatment failed, concluded not that the treatment was wrong but that he hadn't applied it aggressively enough or early enough. That reasoning — failure means do more, not do less — is the engine of everything that came later.
Cameron's own colleagues couldn't sort him into a single category, and their attempt to describe him is one of the most remarkable character sketches in the book. He was, they said, "warm, distant, dedicated, evil, heroic, pathological, vindictive, and fair almost to a fault. A tyrannical, democratic, eagle-beaked loner who brooked no opposition, welcomed the view of others, and pushed forward the frontiers of psychiatry while ruthlessly expanding the psychiatric empire he was building in Montreal. He had an almost magical clinical touch with his patients and an addled persistence for wrong-headed therapy."4
Read that list again. Every pair is a contradiction: warm and distant, heroic and evil, welcomed others' views and brooked no opposition. This isn't a muddled description; it's an accurate one of a genuinely contradictory man. And the contradictions weren't incidental — they were the mechanism of the harm. The warmth (seeing patients twice a day, the "magical clinical touch") is what made patients trust him and vie for his attention. The tyranny (brooking no opposition, the "addled persistence for wrong-headed therapy") is what let him override every warning sign and every colleague's objection. A purely cold man couldn't have won his patients' trust; a purely warm one couldn't have overridden their destruction. Cameron needed both, and had both.
His public battles show the same doubleness. He rejected religion as "superstitious rubbish," believing religious orthodoxy produced guilt-stricken patients, and he called for humanism over moralism — a progressive, even admirable stance. But he pressed it so aggressively that in 1951, in the middle of a fund-raising drive for his institute, he provoked a public confrontation with the Anglican Church that united the usually-feuding Catholic and Anglican churches of Montreal against him.5 The reformer's zeal, uncontained by prudence, made enemies and burned bridges — the same uncontained zeal that, turned on his patients, would burn their minds.
Here's the detail that makes Cameron a study in how institutions fail to see the danger in their own stars. When McGill and the Royal Victoria Hospital sought a founding director for the new Allan Memorial Psychiatric Institute in 1943, Cameron looked, on paper, ideal — an internationally reputed researcher, a vocal advocate for better treatment of mental illness. He'd even been consulted by the Nuremberg tribunal to examine Rudolf Hess.6
There was one warning, and it's worth its weight: a reference letter praised his scientific papers but noted, obliquely, that the writer was "not so sure on the personality side and its adjustment to McGill conditions." A quiet flag about the man's character, buried in an otherwise glowing recommendation. The institution hired him anyway, because the paper credentials were dazzling and the flag was soft.
And his early tenure genuinely delivered on the promise: he built a large department, opened the first unlocked psychiatric facility in Canada and the first psychiatric day hospital in North America, advocated for halfway houses and better medical education about mental illness. Real reforms, real good.7 The Allan Institute was housed in Ravenscrag, a foreboding seventy-two-room limestone mansion, and Cameron rose to become president of the American Psychiatric Association in 1952, working the Washington cocktail circuit alongside Harold Wolff and William Sargant, where they all encountered CIA director Dulles.
So the institution got exactly the reformer it wanted — and the reformer was also the man who would set up a "ghastly assembly line" in the mansion's stables. The soft warning about "the personality side" was the only sign, and it was drowned out by the credentials. Cameron is the case that asks: when a candidate's brilliance is dazzling and the warning is a single soft sentence about character, which does the institution heed? It heeds the brilliance, and installs the man who will use his real reforming gifts as the cover and the platform for real destruction. His most alarming idea — that at the end of World War II he had proposed using ECT to "denazify" Germany by administering it to every German over the age of twelve — should have told them everything: here was a man who thought mass involuntary brain-alteration was a reasonable policy. They made him a founding director instead.8
You are an institution evaluating a brilliant, reforming star who also frightens you a little. Cameron shows you how you'll get it wrong.
You read the credentials and they dazzle — international reputation, real innovations, a consultancy at the century's most famous tribunal. You want this person; they'll build your institute and burnish your name.
You get one soft warning — a reference that praises the work but hedges on "the personality side." It's a single sentence, easily discounted against a mountain of achievement, and you discount it. You don't ask what the hedge means, because asking might cost you the star.
You hire them, and at first they deliver — real reforms, genuine good, the unlocked ward, the day hospital. This confirms your choice and quiets your unease. The warmth is real; patients trust them; the clinical touch is magical.
And then the same qualities that made them a great reformer — the zeal, the refusal to brook opposition, the conviction that failure means doing more — turn, uncontained, on the people they're meant to help. What tells you the danger was always visible is that it was visible: the soft character warning, the "denazify with ECT" idea, the pattern of concluding that failed treatments needed to be applied harder. You had the signs. You heeded the brilliance instead, because the brilliance was dazzling and the signs were soft, and you installed the reformer who would use his real gifts as the platform for real destruction.
The evidence is Cameron's documented biography — the Scottish origins, the five jobs, the insulin-coma work, the Allan directorship and its reforms, the APA presidency, the Anglican confrontation, the "denazify" proposal, the reference letter's warning, and the colleagues' contradictory character sketch. His career is well-documented, including by the institutions that later had to reckon with him.
The central tension is the one the whole portrait is built to hold: was Cameron a good man corrupted by zeal, or a dangerous man whose reforms were incidental? Dimsdale refuses the easy answer, and the colleagues' "warm, distant, dedicated, evil, heroic" sketch insists on the harder one — he was genuinely both, and the goodness and the harm shared a single root. The unresolved question that matters beyond Cameron: if the qualities that make someone a great reformer (zeal, conviction, refusal to accept the status quo) are the same qualities that, uncontained, make them a destroyer, then how does any institution keep the reformer's gifts while restraining their dangers? Cameron suggests the restraint has to come from outside — from colleagues empowered to say no, from a culture of consent and contrary data — because the reformer's own conviction is precisely what won't restrain itself. And Cameron had no such external restraint; he "brooked no opposition," and the institution that could have provided it was dazzled into installing him instead.
This portrait anchors the whole Cameron cluster. It's the man behind The Depatterning Assembly Line and Psychic Driving and Dynamic Implants — the character whose zeal-plus-blindness produced those methods. And it's the reckless appropriator against whom the careful Montreal milieu is measured: Penfield, Hebb, and Milner had comparable brilliance and vastly more restraint, which is the whole difference.
Cameron converges with Sidney Gottlieb as a study in sincere harm — both did real damage in the sincere belief they served a good end (Gottlieb national survival, Cameron the cure of mental illness). And his soft-warning-drowned-by-credentials story pairs with Harold Wolff: both were eminent, forceful men whose institutions couldn't or wouldn't restrain them, proving that eminence plus force plus no external check is the recurring recipe for the book's atrocities.
To behavioral-mechanics — Demand for Purity. Cameron's animating logic — that failure means intensify, never abandon; that if some ECT helped, more must help; that the cure lies always further along the same road — is the clinical form of the demand-for-purity ratchet. Demand for purity sets an unreachable standard so the subject is always failing and always must do more; Cameron set an unreachable therapeutic standard (total memory erasure, complete repatterning) so that his patients' failure to improve always meant more depatterning, never a stop. The insight the pairing produces: the ratchet that a coercive group turns on its members, Cameron turned on his patients and, crucially, on himself — his own conviction ratcheting the doses upward past every warning, because in his frame a failed treatment could only mean insufficient treatment. The demand-for-purity structure is dangerous not only as a tool wielded on others but as a self-sealing belief in the wielder, and Cameron shows it can capture the reformer as completely as it captures the recruit — a doctor ratcheting his own patients toward destruction because his framework made stopping unthinkable.
To psychology — The Ordinary Person Thesis. Cameron extends the ordinary-person thesis into its most uncomfortable territory: the perpetrator who is not only ordinary but admirable — a genuine reformer, a caring physician, a man of real gifts. The insight the pairing produces: the thesis usually reassures us that victims aren't weak; Cameron's version disturbs us by insisting perpetrators aren't monsters. He was warm, dedicated, caring, reforming — and he destroyed people. If the qualities of a healer and a wrecker can coexist in one admirable man, then we cannot identify dangerous actors by their character, their credentials, or even their evident compassion, because Cameron had all three in the good direction and did harm anyway. This is the darkest reach of the ordinary-person thesis: not merely that ordinary people can be broken and ordinary people can perpetrate, but that good people — reformers, healers, the genuinely caring — can perpetrate great harm precisely through their virtues, which means vigilance can never rest on judging the person and must always rest on external checks, consent, and contrary data that restrain even the admirable.
Sharpest implication: Cameron destroyed the people he sincerely wanted to save, and his cruelty grew directly out of his zeal to help — the warmth that won his patients' trust and the tyranny that overrode their destruction were the same man, the goodness and the harm sharing a single root. His institution had the warning signs (the soft character flag, the "denazify with ECT" idea, the pattern of "failure means do more") and heeded his dazzling brilliance instead. The deepest lesson is that the qualities making a great reformer — zeal, conviction, refusal of the status quo — are the same qualities that, uncontained, make a destroyer; the reformer's own conviction won't restrain itself, so the restraint must come from outside, and Cameron, who "brooked no opposition," had none.
Generative questions: