He Who Acts Through Another Acts Himself

Transfers

Qui facit per alium facit per se: he who acts through another acts himself. The maxim collapses one of the most natural-seeming distinctions in human affairs — the distinction between doing something yourself and having someone else do it for you. The maxim says: there is no distinction. Delegation is extension, not separation. When you act through an agent, you are acting. The agent’s hands are your hands.

This is a paradigm, not merely a rule. Remove it and entire fields of law, ethics, and organizational theory lose their vocabulary:

• Delegation does not dilute responsibility — the most fundamental structural claim. A CEO who directs a subordinate to destroy documents has destroyed documents. A general who orders a subordinate to commit an atrocity has committed an atrocity. A company that hires a contractor to dump waste has dumped waste. The maxim prevents the laundering of accountability through intermediaries. You cannot place a human buffer between yourself and the consequences of your decisions.
• Agency is expansion, not transfer — the maxim reframes what delegation means. It is not that the principal transfers their agency to another person. It is that the principal extends their own agency through another person. The agent becomes a prosthesis of the principal’s will. This is why the principal is liable for the agent’s authorized acts: those acts are, in the legal and moral framework, the principal’s acts performed by different means.
• It generates vicarious liability — the entire doctrine of vicarious liability rests on this maxim. Employers are liable for employees’ torts committed within the scope of employment. Corporations are liable for their officers’ decisions. Military commanders are liable for troops under their command. Without this maxim, each of these doctrines would need independent justification. With it, they are applications of a single principle.
• It structures modern AI accountability — when an algorithm makes a decision that harms someone, the maxim insists on asking: who deployed the algorithm? Who trained it? Who chose to rely on its output? The algorithm is the agent; the deployer is the principal. The maxim refuses to accept “the computer decided” as an answer, just as it refuses to accept “my employee decided” or “my contractor decided.” Someone authorized the action and inherits the consequences.

Limits

• Agents have independent judgment — the maxim treats the agent as an extension of the principal’s will, but agents are autonomous beings with their own intentions, biases, and decisions. An employee who commits fraud while on a business trip is not executing the employer’s will through different hands — they are exercising independent judgment that the employer neither authorized nor desired. The scope-of-employment doctrine attempts to manage this tension, but the underlying problem remains: the maxim’s model of agency-as-extension cannot account for agent autonomy.
• Long chains of delegation attenuate control — the maxim works cleanly for direct principal-agent relationships but strains in complex organizations. Holding a CEO personally responsible for a front-line worker’s decision six levels down treats the organization as though it has no internal structure. In practice, information degrades, instructions are reinterpreted, and local conditions produce decisions that no one at the top anticipated or would have endorsed. The maxim’s clean attribution of acts collapses organizational distance that is real and consequential.
• It can be weaponized upward — the maxim is designed to prevent principals from evading responsibility by hiding behind agents. But it can also be used to assign blame to people who had nominal authority but no practical control. A CEO who inherits a dysfunctional compliance program bears formal responsibility under this maxim for violations that began years before their tenure. The maxim’s structural logic — you authorized the agent, you own the agent’s acts — can produce attributions that feel more like scapegoating than accountability.
• Emergent outcomes have no principal — the maxim assumes that every act traces back to a principal who authorized it. But many harmful outcomes emerge from systems where no single actor directed the result. Market crashes, environmental degradation, and algorithmic bias often arise from the interaction of many authorized decisions, none of which individually intended the aggregate outcome. The maxim cannot assign responsibility for emergent harms because there is no single “he who acts” to hold accountable.
• It conflicts with proportional punishment — if the principal is as guilty as if they had personally performed the agent’s act, the maxim implies equivalent punishment. But moral intuition often distinguishes between the person who pulls the trigger and the person who orders the killing. Degree of separation, directness of control, and specificity of instruction all affect moral judgment in ways the maxim’s binary logic cannot express.

Expressions

• “Qui facit per alium facit per se” — the Latin maxim, foundational in agency law
• “The buck stops here” — Truman’s desk sign, the executive branch application of the maxim
• “You can delegate authority but not responsibility” — the management maxim derived from the same principle
• “Command responsibility” — international humanitarian law doctrine holding military commanders liable for subordinates’ war crimes
• “The company did this, not some rogue employee” — the organizational accountability framing
• “Who deployed the algorithm?” — the AI ethics version, refusing to accept “the computer decided” as an answer
• “Respondeat superior” — the closely related legal doctrine that applies this maxim to employment relationships

Origin Story

The maxim qui facit per alium facit per se entered English law from medieval canon law and Roman jurisprudence. It was well established by the time of Coke (early seventeenth century) and became a cornerstone of the law of agency. Broom included it in his Selection of Legal Maxims as one of the fundamental principles governing relationships of authority and delegation.

The maxim gained particular force in the development of corporate law, where the legal fiction of corporate personhood required a principle for attributing human actions to non-human entities. If a corporation can only act through its officers and employees, then the corporation acts when they act — qui facit per alium facit per se applied to the corporate form.

In the twentieth century, the maxim acquired new urgency through the Nuremberg trials and subsequent development of command responsibility doctrine in international humanitarian law. The defense of “I only gave the orders” is the inverse of the maxim’s claim: the maxim says that giving the orders is doing the act. The tension between this principle and practical questions of knowledge, control, and organizational distance continues to shape accountability law.

References

• Broom, H. A Selection of Legal Maxims (1845; 10th ed. 1939)
• Coke, E. Institutes of the Laws of England (1628-1644)
• Restatement (Third) of Agency (2006) — modern American codification of agency principles
• Yamashita v. Styer, 327 U.S. 1 (1946) — command responsibility doctrine in military law