No, it is not. Positive psychology has many distinguished ancestors. Since at least the time of Socrates, Plato, and Aristotle, the “good life” has been the subject of philosophical and religious inquiry. Psychologists have been working in positive psychology for decades. It just hasn’t been called positive psychology. To name just a few: Rogers (1951) and Maslow (1970) who are founders of the field of humanistic psychology, prevention programs based on wellness by Albee (1982) and Cowen (1994), work by Bandura (1989) and others on self-efficacy, research on gifted individuals (e.g., Winner, 2000), broader conceptions of intelligence (e.g., Gardner, 1983; Sternberg, 1985), among many others. Marie Jahoda (1958) made the case for understanding well being in its own right, not simply as the absence of disorder or distress.
Positive psychology acknowledges a debt to humanistic psychology, which was popular in the 1960s and 1970s and has many followers to this day. Abraham Maslow and Carl Rogers (among others) proposed that people strive to make the most of their potential in a process called self-actualization, which can be thwarted or enabled by a variety of conditions. Humanistic psychology emphasizes the goals for which people strive, their awareness of this striving, and the importance of rational choice in this process.
Today’s positive psychologists have not invented the study of happiness, well being, or strengths. The contribution of contemporary positive psychology has been to make the explicit argument that what makes life most worth living deserves its own empirically based field of study, to provide an umbrella term that brings together isolated lines of theory and research, to promote the cross-fertilization of ideas in related fields through conferences, summer institutes and research grants, to develop a comprehensive conceptual view of broad notions of happiness, to bring this field to the attention of various foundations and funding agencies, to help raise money for research, and to firmly ground assertions on the scientific method.