Russ Shafer-Landau is a professor of philosophy who has authored and edited several books on ethics. The document discusses two types of ethical subjectivism: normative and meta-ethical. Normative subjectivism holds that an act is morally right if the person judging approves of it. Meta-ethical subjectivism claims that moral judgments cannot be true or false. The document presents arguments for each view and considers objections, such as disagreement in ethics not proving lack of objective truth and moral judgments potentially being factual beliefs that do not intrinsically motivate.