Wilhelm Wundt
Wilhelm Maximilian Wundt (; ; 16 August 1832 – 31 August 1920) was a German physician, physiologist, philosopher, and professor, known today as one of the founding figures of modern psychology. Wundt, who noted psychology as a science apart from philosophy and biology, was the first person ever to call himself a psychologist. He is widely regarded as the "father of experimental psychology". In 1879, Wundt founded the first formal laboratory for psychological research at the University of Leipzig. This marked psychology as an independent field of study. By creating this laboratory he was able to establish psychology as a separate science from other disciplines. He also formed the first academic journal for psychological research, "Philosophische Studien" (from 1881 to 1902), set up to publish the Institute's research.
Daniel Levinson
Daniel J. Levinson (May 28, 1920 – April 12, 1994), a psychologist, was one of the founders of the field of positive adult development. Levinson is most well known for his theory of stage-crisis view, however he also made major contributions to the fields of behavioral, social, and developmental psychology. His interest in the social sciences began with studies on personality and authoritarianism, and eventually progressed to studies on development. Greatly influenced by the work of Erik Erikson, Elliott Jaques, and Bernice Neugarten, his stage-crisis view sought to incorporate all aspects of adult development in order to establish a more holistic approach to understanding the life cycle. In doing so, Levinson discussed the various developmental tasks and/or crises that one must address within each stage as well as how they contribute to the progression of development. Although much controversy surrounds his research methods, Levinson interviewed both men and women to uncover concrete patterns that occur within similar age ranges. Through these studies, he determined that men and women essentially progress through the same cycle of life, however they differentiate in what he refers to as "The Dream". He published his findings and theory within his two major books, "The Seasons of a Man's Life" and "The Seasons of a Woman's Life"; both of which remain as influential publications within the field of psychology. Being both simple in nature and open to further investigation, Daniel Levinson's legacy and lasting contributions are mainly to theory and entail profound implications for social as well as behavioral psychology.