What Is a Fiduciary?A fiduciary is a person or organization that acts on behalf of another person or persons, putting their clients' interests ahead of their own, with a duty to preserve good faith and trust. Being a fiduciary thus requires being bound both legally and ethically to act in the other's best interests. A fiduciary may be responsible for the general well-being of another (e.g. a child's legal guardian), but often the task involves finances; managing the assets of a...